How to Clean Fixed Insoles in Shoes Without Damaging Them

Anyone who wears running shoes, smart business shoes or trainers with fixed, glued-in footbeds knows the issue: the outside still looks great, but the inside smells like a changing room. With the right method, you can clean non-removable insoles thoroughly, cut down bacteria and rescue the shoes-without wrecking the adhesive, cushioning or shape.

Why fixed insoles are a particular challenge

With removable insoles it’s straightforward: take them out, wash, dry, done. Fixed insoles, however, are stitched or bonded directly to the midsole. If you pull at them, you can quickly damage the entire shoe construction.

On top of that, the footbed sits deep inside the shoe. Water, foam and cleaners are harder to apply properly, and any moisture takes much longer to dry. That combination of sweat, bacteria and lingering damp is exactly what creates stubborn odours and, over time, can make materials brittle.

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, there can be very different layers under your foot:

• Foam or memory foam for soft cushioning
• Gel elements in sports shoes for extra spring
• Textile or mesh covers, often designed to wick moisture
• Leather surfaces in smarter shoes
• In some cases, antibacterial or odour-inhibiting coatings

Harsh cleaners or too much water can ruin these layers, loosen glue or cause foam to crumble. That’s why the rule is: work gently, target specific areas, and stay in control.

Basic cleaning: step by step

Before you reach for any wet cleaning, clear out anything loose inside the shoe first. The less debris you’re dealing with, the better your cleaner will work.

1. Loosen dry dirt

• Tap the shoes together to knock out sand and dust.
• Brush the footbed with a soft brush or a dry cloth.
• Be especially thorough in the toe box and along the edges.

This prevents you from simply spreading grime around when you move on to damp cleaning.

2. Gentle cleaning with a soapy solution

In a bowl, combine warm water with a small amount of mild washing-up liquid or a dedicated shoe cleaner. Use only a little-the mix should stay clear, not froth up like a full bath.

• Dip a microfibre cloth or soft sponge into the solution.
• Wring it out well; it should be damp, not dripping.
• Wipe the insole using small circular motions.
• Work on heavily soiled or discoloured patches more precisely.
• Use a second, slightly damp cloth to remove any soap residue.
• Finally, blot up moisture with kitchen roll or a clean towel.

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

3. Home remedy for strong odour: bicarbonate of soda & more

If the shoes already smell strongly or you can see dark sweat marks, soapy water often isn’t enough. In that case, bicarbonate of soda (baking soda, not baking powder) is a mild option for cleaning and deodorising.

How to do a bicarbonate treatment:

• Mix a little bicarbonate of soda with a few drops of water to form a thick paste.
• Apply the paste to the affected areas.
• Leave it to work for about 15 minutes.
• Wipe it away carefully with a slightly damp cloth, lifting off the residue.

Bicarbonate of soda binds odour molecules and has a gentle abrasive effect, without being too aggressive on foam and textiles.

Cleaning products compared

Different options come with different strengths. The overview below helps you choose:

Cleaning solution	Best used for	Application	Typical drying time
Mild soapy solution	General dirt	Damp cloth	24–48 hours
Bicarbonate mixture	Stains and strong odour	Targeted as a paste	12–24 hours
Alcohol-water mix	Disinfection	Spray or wipe	6–12 hours
Diluted white vinegar	Odour neutralisation	Light mist	12–24 hours

Important: always test on an inconspicuous area first to check the material keeps its colour and shape before treating the whole shoe.

Drying properly: how to prevent mould and mustiness

After cleaning, drying is what decides whether the shoes stay fresh-or smell worse again two days later. Direct heat is off limits.

What you should definitely avoid

• Putting shoes on a radiator
• Blowing a hairdryer into the inside
• “Quick-drying” in the oven

Sudden heat can soften glue, warp plastics and make foam turn crumbly.

Gentle drying, step by step

• Place the shoes somewhere well ventilated and out of direct sun.
• A spot with light airflow is ideal-for example near an open window or in front of a fan.
• Stuff the inside with newspaper or kitchen roll.
• Replace the paper several times in the first few hours while it’s still damp.
• Leave the shoes for at least 24 hours; if they got very wet, allow up to 48 hours.

Only start wearing the shoes again when everything feels dry-even deep in the toe area.

If your home is very humid, you can put the shoes in a laundry bag and set them near a dehumidifier. This helps the remaining moisture disappear much faster.

Keeping them fresh: care between washes

Even the best clean doesn’t help much if the shoes immediately go back into a damp, sealed cupboard. A few simple habits will keep the footbed fresher for longer.

Air them properly after every wear

• After taking them off, leave shoes open to air out at least overnight.
• Don’t store them straight away in tight lockers, closed cupboards or gym bags.
• If you like, use cedar shoe trees, which help absorb moisture and odour.

Sports shoes in particular benefit from getting air after training, rather than being left to “mature” in the boot of the car.

Prevent odour with sprays and powders

There are shoe sprays and powders available, many based on tea tree oil, eucalyptus or other natural ingredients. They slow bacterial growth and add a fresher scent.

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

If you have sensitive skin, take care with heavily perfumed products and keep an eye on how your feet react.

Shoe rotation, socks & health: what many people underestimate

One point is often missed: shoes need recovery time. If you wear the same pair every day, the insole barely gets the chance to dry out fully. Bacteria thrive in that damp environment.

A better approach is to rotate at least two pairs-and for sports shoes, ideally three. That way, the fixed insoles get a 24-hour break even if you’re not deep-cleaning them each time.

Sock choice matters too. Performance socks made from merino wool or technical sports fibres move sweat away faster than pure cotton. That reduces strain on the insole, lowers moisture levels and helps control odour.

If you regularly struggle with very sweaty feet, or you keep finding fungal issues in shoes despite good care, it’s worth seeking medical advice. In those cases, hygiene tricks alone often aren’t enough and the skin may need treatment.

When cleaning is no longer worth it

At some point, every insole reaches the end of its life. Common warning signs include:

• The foam underfoot feels uneven or starts to crumble.
• Even after a thorough clean, the smell turns unpleasant again within a few hours.
• The surface shows cracks, deep discolouration or areas that are coming away.

In situations like these, the only real option is often to retire the shoes-especially if the insole is truly built in and can’t be replaced properly. In some cases, specialist retailers or a cobbler can assess whether rebuilding with new footbeds makes sense; with expensive walking boots or high-quality leather shoes, it can be worth it.

If you spot the signs early and clean fixed insoles gently and regularly, you’ll save money in the long run, look after your feet, and feel far less self-conscious about your shoes day to day-whether you’re at the office, the gym, or visiting friends.