01Why oil and towels do not get along
A good massage uses a generous amount of oil, and almost all of it that does not soak into the client's skin ends up in towels. Towels drape the body, wipe excess oil from the back, cover the couch and wrap the client at the end. Over a day, a busy treatment room can send dozens of towels to the laundry, each carrying a little more oil than the last.
Water and oil do not mix. An ordinary wash that is perfect for towels soiled with sweat or water does not fully remove oil. A thin film stays in the fibres, wash after wash, until the towels change character. They feel stiff or slightly tacky instead of soft. They stop absorbing properly. They turn grey or develop darker patches. They smell faintly stale or rancid, even straight from the dryer. Spa owners often blame the towels or the laundry, when the real cause is oil that has never been fully removed.
This guide explains how massage oils and products behave in fabric, what oil build-up looks and smells like, and how to handle towels from the treatment room to the shelf so they stay soft and fresh. It also covers an important safety issue: oily towels and tumble dryers.
Who this is for
Day spas, hotel spas, massage clinics, beauty salons, physiotherapy and sports massage clinics, and mobile therapists who use oils, lotions, balms or waxes and send towels to be washed.
02What is on the towels
Treatment rooms use a wide range of oils and products. They behave differently in the wash.
| Product | Examples | How it behaves in towels |
|---|---|---|
| Plant carrier oils | Sweet almond, grapeseed, sunflower, coconut | Spread through fibres; can oxidise and smell stale |
| Jojoba | Often used for facial and body work | Technically a liquid wax; clings stubbornly |
| Mineral oils | Some massage blends and baby oils | Do not go rancid but are hard to wash out |
| Lotions and creams | Massage lotions, body butters | Mix of oil, water and thickeners; easier but still leave residue |
| Balms and waxes | Massage balms, depilatory wax | Solid fats and waxes; can harden in fibres |
| Essential oils | Aromatherapy blends | Small amounts, strong scent; add to oil load |
| Clay, mud and seaweed | Body wraps | Fine particles that stain and clog fibres |
Oils that change over time
Many plant oils react slowly with air. In a towel, that reaction can make the oil thicker and stickier, and it produces the stale, rancid smell many spa owners recognise. The longer oily towels wait before washing, the more this happens.
Mixed products
A single treatment can involve a cleanser, an oil, a mask and a moisturiser. Towels from facials and body treatments often carry a mix of oils, waxes and fine particles.
03Signs of oil build-up
Oil build-up creeps up slowly, so it is easy to miss until towels are badly affected.
- Towels feel stiff, waxy or slightly sticky rather than soft.
- They push water around instead of absorbing it.
- White towels look grey or have darker patches where oil was heaviest.
- They smell stale, nutty or rancid, especially when warm.
- They feel heavier than new towels of the same size.
- Lint and fluff stick to them.
The warm smell test
Take a clean, dry towel from the shelf and hold it in your hands for a minute, or run it under warm water. If it smells stale or sour when warm, oil residue is still in the fibres.
04Keep oily towels apart
The single most useful step is to separate oily towels from everything else at the source.
In the treatment room
Have a dedicated bin or bag for oily towels in every treatment room. Towels used for drying hands, wrapping clients after a non-oil treatment or covering pillows can go in an ordinary bag.
Why separate
Oily towels washed with lightly soiled towels spread oil across the whole load. Oily towels washed together can be given the treatment they need: pre-treatment, the right detergent and the right temperature.
Label the bags
Mark bags clearly, for example "oil" or "massage", so whoever handles them, in-house or at the laundry, knows what they contain.
05Washing oily towels
Removing oil needs a wash designed for it. A standard towel wash is not enough.
Pre-treatment
Oily towels benefit from pre-treatment that breaks oils down before the main wash. Commercial laundries use products designed for oils and fats; a pre-wash or soak in a suitable product can help on site.
Temperature
Higher temperatures help loosen and remove oil. Cotton towels can usually be washed hot. Always follow the label.
Detergent
Use a detergent suited to oily soil, at the right dose for the load and water hardness. Under-dosing leaves oil behind; heavy overdosing leaves residue.
Load size
Oily towels need room to move and plenty of water. Do not overload.
Rinsing
Thorough rinsing carries loosened oil away. Extra rinses can help.
No softener
Fabric softener adds another waxy layer on top of oil residue. Leave it out.
06Oily towels and fire safety
This is the most important section in this guide.
Fire services in the UK have warned that towels and cloths contaminated with oils, including massage and beauty oils, can in some circumstances heat up on their own and catch fire after being tumble dried. The risk comes from oil left in the fabric after washing reacting with air while the towels are still warm, especially when they are piled up in a heap or left in a dryer that has stopped before cooling down.
How to reduce the risk
- Wash oily towels thoroughly so as little oil as possible remains.
- Always let the dryer complete its full cool-down cycle before removing towels.
- Do not stop a dryer mid-cycle and leave towels inside.
- Spread towels out to cool if they come out warm; do not pile warm towels in a heap or a bag.
- Do not leave dryers running unattended at closing time.
- Keep dryer filters and vents clean.
- Follow your fire risk assessment and any advice from your local fire service.
Why it matters for spas
Spas, salons and massage clinics are exactly the businesses fire services have in mind, because their towels carry oils every day and are often dried on site in the evening.
07Drying oily towels
Beyond fire safety, drying affects how towels feel.
- Dry at a moderate heat, as the label allows.
- Do not over-dry; heat can bake remaining oil into the fibres.
- Let towels cool fully before folding and stacking.
- Check that towels are completely dry.
08Storing clean towels
Clean towels can pick up oil again before they are used.
- Store clean towels away from oil bottles and product shelves.
- Keep warmers and towel cabinets clean; oil can transfer from dirty shelves.
- Do not stack clean towels on trolleys used for oil bottles.
Towel warmers
Many treatment rooms use towel warmers or hot cabinets. Clean them regularly, and only put fully dried, cooled towels into them.
09Rescuing towels with build-up
Towels with heavy build-up can often be improved with a thorough stripping wash, sometimes over more than one cycle. It is worth doing once as a reset, then keeping the new routine so build-up does not return.
Towels that remain stiff, grey or smelly after stripping, or that have hardened oil deposits, are usually best retired from treatment use.
10Facials, masks and skincare
Facial treatments bring a different mix of products: cleansers, toners, exfoliants, masks, serums and moisturisers. Towels used for facials often wrap the hair, cover the chest and wipe the face.
Clay and mineral masks
Clay and mineral masks leave fine particles that settle into towel loops and can leave grey or tinted marks. Rinse off as much mask as possible with disposables or a separate cloth before using a towel.
Coloured products
Some masks and serums are strongly coloured. Charcoal masks leave grey marks; some vitamin and plant-based products leave yellow or orange marks.
Head and hair towels
Towels wrapped around the hair during facials pick up hair products and oils. They should go into the oily towel bag rather than the general one.
11Body wraps, scrubs and hot stones
Body treatments are among the hardest on towels.
Scrubs
Salt and sugar scrubs are mixed with oils. The grains rinse out easily, but the oil remains. Shake off loose grains before bagging.
Wraps
Seaweed, mud and clay wraps leave heavy residue and can stain. Many spas use disposable sheets or dedicated dark towels for wraps.
Hot stones
Hot stone treatments use oil on warm stones and warm skin. Towels used to hold or wrap stones can be both oily and hot. Let them cool before bagging.
12Waxing and hair removal
Depilatory wax is a mixture of resins and waxes designed to stick. On towels, it hardens and is very difficult to remove.
- Protect couch and towels with disposable paper during waxing.
- Remove spills of wax promptly with the product the wax maker recommends for cleaning.
- Never put towels with lumps of wax into a dryer.
- Bag wax-affected towels separately and label them.
Post-wax oils
Many therapists use oil after waxing to remove residue from skin. That oil ends up on towels too, so treat these towels as oily.
13Choosing towel colours
White towels show oil shadows as grey patches. Many spas choose white for the clean look and accept the extra care needed. Others use darker or neutral colours in treatment rooms, where oil marks are less visible, and keep white for robes and changing rooms.
Darker towels
Dark towels hide oil shadows but can fade with hot washing and do not show when oil is building up. Use the warm smell test and the feel of the towel instead of the look.
Mixed systems
Some spas use one colour for oily treatments and another for everything else, so separation is automatic.
14How many treatment towels
Treatment rooms use more towels than many spas expect: drapes, bolster covers, head towels, hand towels and a final wrap. Count how many towels each treatment uses, multiply by treatments per day and by the days towels are away being washed, then add a margin.
| Treatment | Typical towels |
|---|---|
| Full-body massage | 2 to 4 |
| Facial | 2 to 3 |
| Body wrap or scrub | 3 to 5 |
| Waxing | 1 to 2, plus disposables |
| Hot stone | 3 to 5 |
Towel use per treatment
These are rough guides. Count your own for a week.
15Washing oily towels on site
Many spas wash towels on site. That gives flexibility but needs the right equipment and habits for oily loads.
Equipment
Commercial machines with higher temperatures and better rinsing handle oil far better than domestic ones. Dryers need a proper cool-down cycle and well-maintained vents and filters.
End-of-day drying
The highest-risk moment is the last dryer load of the day. Make sure it is finished, cooled and unloaded before staff leave. If that is not possible, do not start it.
Machine hygiene
Oil builds up in washing machines too, in drums, seals and drains. Follow the maker's maintenance advice.
16Mobile and home-based therapists
Mobile therapists and those working from home face the same oil problems with domestic machines and limited space.
- Use disposable couch roll and wipes to reduce oil on towels.
- Keep oily towels in a separate bag in the car and wash them the same day.
- Wash at the hottest temperature the label allows, with a suitable detergent.
- Never leave a dryer running unattended, and always let it cool down before removing towels.
- Never pile warm towels in a basket or bag.
- Consider sending towels to a laundry if volumes grow.
17Why oil stays in the fibres
It helps to picture what happens inside a towel. Cotton fibres are made of long chains that love water; that is why cotton is absorbent. Oil, on the other hand, does not mix with water at all. When oil lands on a towel, it slips into the spaces between fibres and coats their surfaces.
In a wash, water alone simply flows around the oil. Detergent is what makes the difference: it surrounds tiny droplets of oil so they can be lifted from the fibres and carried away in the water. Heat helps by making the oil runnier and easier to lift. Time and movement help by giving the detergent a chance to work and by flexing the fibres.
If any of these is missing, such as too little detergent, too low a temperature, too short a cycle or too many towels crammed in, some oil stays behind. The next treatment adds more. Over weeks, the layer builds until it changes how the towel feels and smells. That is why oil build-up is a process, not a single event, and why the fix is a routine, not a one-off product.
Why it smells
Many plant oils slowly react with oxygen in the air. In a thin film spread across warm fibres, there is a lot of surface for that reaction to happen. The products of the reaction have the stale, crayon-like or rancid smell that people associate with old cooking oil. Warmth speeds it up, which is why towels from a towel warmer or a dryer can smell worse than towels at room temperature.
18What clients notice
A spa treatment is a sensory experience. Clients notice the scent of the room, the temperature, the music and the feel of every surface that touches them. Towels are in direct contact for the whole treatment.
- A towel that feels slightly sticky or stiff on bare skin.
- A faint stale or rancid smell under the scent of essential oils.
- Grey patches on a white towel draped over them.
- A robe or wrap that does not absorb water after a shower.
Clients rarely say anything during a treatment, but these details shape whether they rebook and what they write in reviews. In a spa, the towels are part of the product.
19Towel warmers and hot cabinets
Warm towels are a lovely touch, but towel warmers and hot cabinets need care in a spa that uses oils.
Only clean, cool, dry towels
Put towels into warmers only after they have been fully washed, dried and cooled. A warmer is not a dryer, and it should never receive towels straight from the dryer drum.
Clean the warmer
Oil and product residue builds up on the inside of warmers and is transferred to clean towels. Clean warmers regularly according to the maker's instructions.
Do not overfill
Overfilled warmers heat unevenly and keep towels warm for long periods. Load only as many towels as you will use in the next few treatments.
Smell check
If towels from the warmer smell stale but towels from the shelf do not, the warmer itself, or the time towels spend in it, is part of the problem.
20Choosing oils with towels in mind
The oil you choose is a treatment decision first, but it does affect laundry. Some therapists find that switching to a lighter oil, a lotion or a blend designed to wash out more easily reduces towel problems without changing the treatment much.
- Lighter oils spread thinner and are easier to remove than heavy oils.
- Lotions and creams leave less free oil than pure oils.
- Some professional massage products are formulated to wash out of linen more easily; ask your supplier.
- Using less product, applied more often, can reduce how much reaches towels.
The client's experience comes first, but if two products give the same result, choosing the one that is kinder to towels saves money and trouble.
21Robes, slippers and wraps after treatments
Clients often put a robe back on straight after an oil treatment, and some sit in the relaxation room in their robe for an hour. Robes then carry oil from the client's skin, especially at the collar, back and cuffs.
- Treat robes worn after oil treatments as oily items in the wash.
- Offer a fresh towel to wipe off oil before the client puts their robe back on.
- Check robe collars and backs for oil shadows during inspection.
22Sports massage and physiotherapy clinics
Sports massage and physiotherapy clinics often use less oil than spas but treat more clients per day, sometimes with gels, creams and heat rubs as well as oil.
Heat rubs and gels
Warming creams and gels can contain ingredients that leave a strong smell in towels, and some can irritate the next client's skin if residue remains. Wash these towels thoroughly and keep them in the oily bag.
Taping
Sports tape adhesive sometimes transfers to towels and couch covers. Small sticky patches pick up lint. Remove what you can before washing.
High throughput
Clinics with back-to-back appointments may use couch roll for most contact and towels mainly for draping. Even so, the towel count adds up quickly over a full clinic day.
23Beauty salons
Beauty salons use oils and creams in manicures, pedicures, facials and massage add-ons. Towels used under hands and feet pick up cuticle oil, hand cream, nail polish remover and polish.
- Keep a separate bag for towels used in nail treatments, especially those marked with polish.
- Avoid letting nail polish remover soak into towels; it can damage some fibres and spread colour.
- Pedicure towels may also carry foot soak products and need a thorough wash.
- Use darker towels for nail work if polish marks are a constant problem.
24Layering the couch to protect towels
How the treatment couch is set up decides how much oil reaches towels. A well-layered couch keeps oil off the expensive layers and onto the cheap, disposable ones.
From the bottom up
A typical set-up starts with a wipe-clean couch surface, then a fitted couch cover, then couch roll or a disposable sheet, then a towel or sheet under the client and a towel or blanket on top. Oil mainly reaches the layer directly under and on top of the client.
Using couch roll
Couch roll under the client's body catches a lot of oil that would otherwise soak through to the couch cover. It is changed for every client, so the couch cover stays cleaner for longer and needs washing less often.
Face cradle
The face cradle gets oil and make-up from the client's face and hair. Disposable face-cradle covers, or a washable cover changed for every client, keep the cradle and the towels nearby cleaner.
Bolsters
Bolsters under knees and ankles touch oily skin. Cover them with a towel or a washable cover that goes into the oily bag after each client.
25Where used oily towels should wait
Between the treatment room and the wash, oily towels need a safe place to wait. Choose a cool, well-ventilated area away from heat sources such as boilers, dryers, towel warmers and sunny windows. Use breathable bags or open-sided carts rather than sealed plastic sacks. Keep the waiting time short: get oily towels washed the same day or collected the next morning. And never store bags of used oily towels next to freshly dried towels or inside the laundry room where dryers are running, since warmth makes both the smell and the heating risk worse.
How ArkLaundry helps
Spa towels are pre-treated for oil before washing and dried at the right heat so they stay soft. Hand towels from your own stock are £0.90 each, bath towels £1.45, excluding VAT.
