How to Clean Fixed Insoles Properly

Anyone who wears trainers, business shoes or sneakers with permanently bonded footbeds will know the issue: the outside of the shoe looks immaculate, while the inside smells like a changing room. With the right method, you can thoroughly clean fixed insoles, reduce bacteria and save the shoe without damaging the adhesive, cushioning or shape.

Why fixed insoles are particularly challenging

With removable insoles, the process is straightforward: take them out, wash them, dry them and put them back. Fixed insoles, however, are sewn or glued directly to the midsole. Pulling at them can quickly damage the shoe’s entire construction.

The footbed is also positioned deep inside the shoe. Water, foam and cleaning products are difficult to apply there, while moisture takes considerably longer to dry. This mix of sweat, bacteria and residual damp is exactly what causes persistent odours and can make the material brittle over time.

Fixed insoles always need two things at once: as little water as possible and as much hygiene as necessary.

What materials are used in fixed insoles?

Depending on the shoe model, several very different layers may sit beneath your feet:

• Foam or memory foam for soft cushioning
• Gel components in trainers for extra bounce
• Textile or mesh coverings, often designed to move moisture away
• Leather surfaces in smart shoes
• In some cases, antibacterial or odour-inhibiting coatings

Harsh cleaning agents or excessive water can damage these structures, loosen adhesive or cause foam to crumble. The rule is therefore to work gently, locally and in a controlled way.

Deep cleaning fixed insoles: step by step

Before using any wet cleaning method, first remove everything loose from the shoe. The less dirt present, the more effectively the cleaner can work.

1. Remove dry dirt

• Tap out the shoes to dislodge sand and dust.
• Brush the footbed with a soft brush or dry cloth.
• Work particularly carefully in the toe box and around the edges.

This prevents dirt from simply being spread around rather than removed during wet cleaning.

2. Clean gently with a soap solution

In a bowl, combine warm water with a small amount of mild washing-up liquid or a specialist shoe cleaner. Use only a little product: the solution should remain clear rather than foaming like a bubble bath.

• Dip a microfibre cloth or soft sponge into the solution.
• Wring it out firmly so that it is only damp, never dripping wet.
• Wipe the insole using small circular movements.
• Treat heavily soiled or discoloured areas with particular care.
• Remove soap residue using a second, lightly dampened cloth.
• Finally, blot away moisture with kitchen roll or a clean towel.

The less liquid you use, the lower the risk of loosened adhesive and stale residual damp.

3. Home remedies for strong odours: bicarbonate of soda and more

If the shoe already has a pronounced smell or dark sweat marks have appeared, soapy water is often insufficient. Bicarbonate of soda, not baking powder, can then help as a mild cleaner and odour treatment.

To use a bicarbonate of soda treatment:

• Mix a little bicarbonate of soda with a few drops of water to make a thick paste.
• Apply the paste to the affected areas.
• Leave it to work for around 15 minutes.
• Carefully wipe it away with a lightly damp cloth, picking up any remaining residue.

Bicarbonate of soda binds odour molecules and provides a light abrasive action without being too aggressive on foam or textile materials.

Cleaning products compared

Different solutions offer different benefits. This overview can help you choose:

Cleaning solution	Suitable for	Application	Typical drying time
Mild soap solution	General dirt	Damp cloth	24–48 hours
Bicarbonate of soda mixture	Stains and strong odours	Applied locally as a paste	12–24 hours
Alcohol-water mix	Disinfection	Spray or wipe on	6–12 hours
Diluted white vinegar	Odour neutralisation	Light spray mist	12–24 hours

Important: always test on an inconspicuous area first to check that the material remains colourfast and keeps its shape before treating the entire shoe.

Drying properly: preventing mould and musty smells

After cleaning, drying determines whether the shoe stays fresh or smells worse than before two days later. Direct heat is off limits.

What you should definitely avoid

• Putting shoes on a radiator
• Blowing hot air into them with a hairdryer
• ‘Quick-drying’ them in the oven

Such heat shocks can melt adhesive, warp synthetic materials and make foam crumbly.

Gentle drying, step by step

• Place the shoes in a well-ventilated, shaded spot.
• A location with gentle airflow is ideal, such as in front of a fan or near an open window.
• Stuff the inside with newspaper or kitchen roll.
• Replace the paper several times during the first few hours while it is still damp.
• Leave the shoes for at least 24 hours, or up to 48 hours if they are very wet.

Only wear your shoes again when even the deep toe area feels completely dry.

If you live in a very damp home, place the shoes in a laundry bag near a dehumidifier. This helps residual moisture disappear much faster.

Keeping shoes fresh: care between washes

Even the best cleaning routine has little effect if shoes are immediately left damp and shut away in a cupboard. A few habits will keep the footbed fresh for much longer.

Air them properly after every wear

• Leave shoes open overnight at a minimum after taking them off.
• Do not put them straight into tight lockers, closed cupboards or gym bags.
• If you like, use cedar shoe trees, which absorb moisture and odours.

Trainers in particular benefit from being aired after exercise instead of being left to ‘mature’ in the boot of a car.

Prevent odours with sprays and powders

Specialist shoe sprays and powders are widely available, many of them based on tea tree oil, eucalyptus or other natural ingredients. They slow bacterial growth and provide a fresh scent.

• Apply them only to completely dry insoles.
• Use sprays sparingly, until the surface is lightly moistened.
• Ideally, sprinkle in powder during the evening and shake out any excess in the morning.

Anyone with sensitive skin should take care with strongly perfumed products and monitor how their feet react.

Shoe rotation, socks and health: what many people overlook

One factor is often missed: shoes need recovery time. Wearing the same pair every day gives the insole hardly any chance to dry completely. Bacteria thrive in this damp environment.

A better approach is to alternate at least two pairs, or even three pairs of trainers. This gives each set of fixed insoles a 24-hour break, even if you do not clean them thoroughly every time.

Your choice of socks also matters. Performance socks made from merino wool or sports fibres wick sweat away faster than pure cotton. This reduces the burden on the insole, cuts moisture and limits odours.

If you regularly struggle with very sweaty feet or repeatedly notice fungal infection in your shoes despite proper care, seek medical advice. Hygiene measures alone are often no longer enough, and the skin may need treatment.

When cleaning is no longer worthwhile

Every insole eventually reaches the end of its useful life. Typical warning signs include:

• The foam beneath the foot feels uneven or crumbly.
• Even after thorough cleaning, the odour becomes unpleasant again within a few hours.
• The surface has cracks, deep discolouration or areas coming loose.

In these cases, replacing the shoe is often the only option, at least when the insole is genuinely integrated and cannot be professionally replaced. Specialist shops or cobblers can assess whether fitting new footbeds is worthwhile in individual cases; for expensive walking boots or high-quality leather shoes, it may well be worthwhile.

Recognising these signs in good time and cleaning fixed insoles gently on a regular basis saves money in the long term, is kinder to your feet and means you are far less likely to feel embarrassed about your shoes in everyday situations, whether at the office, the gym or visiting friends.