Smelly shoes? Here's how to truly freshen up shoes with fixed insoles.

Many people only notice the smell when they take their shoes off-then discover the insole won’t come out. Sports shoes, trainers and smart leather shoes often have footbeds that are glued or stitched in place. If you clean them the wrong way or use too much water, you can end up with rippled insoles, loosened adhesive and a lingering mustiness. With the right approach, the inside stays clean, hygienic and structurally sound.

Why fixed insoles are so tricky

With removable insoles, the routine is straightforward: take them out, wash them separately, dry them, done. Fixed insoles are different. They’re usually bonded or stitched directly into the midsole and effectively form one unit with the shoe.

Typical materials include:

• Foams and memory foam
• Gel cushioning systems
• Textile top layers with moisture management
• Smooth leather surfaces in business shoes

Each material responds differently to water, cleaning products and heat. If the glue is softened too much or foam becomes saturated, it can warp-or gradually break down and crumble. At the same time, sweat, skin debris and dust build up inside the shoe, creating an ideal environment for bacteria and, in turn, unpleasant odours.

The trick is to clean the insole thoroughly without soaking it-use as little water as possible, and as much cleaning power as necessary.

Preparation: remove loose dirt first

Before you bring any moisture into the equation, a dry clean is worth doing. It stops dirt being pushed deeper into fibres later.

• Use a soft brush to loosen crumbs, dust and grains of sand.
• Work carefully in the toe area and along the edges.
• If you have one, quickly vacuum the inside on a low setting.

If you regularly wear heavily sweat-soaked sports shoes, run a dry cloth lightly over the surface before wet cleaning. This lifts off some of the sweat film straight away.

Cleaning fixed insoles: a gentle wet clean that works

For most shoes, a mild soapy solution is enough. Harsh cleaners or chlorine bleach can damage adhesives, foam and surface coatings.

The ideal everyday mixture for cleaning fixed insoles

Fill a bowl with lukewarm water and stir in a small squirt of mild washing-up liquid or a specialist shoe cleaner. You want light suds-nothing like a bubble bath.

• Dip a microfibre cloth or soft sponge into the solution.
• Wring it out thoroughly until it’s only slightly damp.
• Wipe the insole using small circular motions.
• Work more firmly on dirty patches, but don’t scrub as if you’re scouring concrete.
• Use a second cloth, lightly dampened with clean water, to lift away any soapy residue.
• Finally, blot the insole gently with kitchen roll or a dry towel.

If you’ve used too much water, you’ll notice quickly: the insole feels spongy and the shoe can almost “slosh” when you move it. If that happens, blot again with dry cloths immediately.

Household remedies for stubborn odours and stains

If dark sweat marks remain or there’s still a strong smell, a few reliable kitchen staples can help-used correctly, without wrecking the materials.

Cleaning agent	Best for	How to use	Typical drying time
Mild soap and water	General dirt	Work in with a damp cloth	24–48 hours
Bicarbonate of soda or baking powder paste	Strong odours, stains	Apply, leave to work, wipe off	12–24 hours
Alcohol–water mix	Disinfection	Lightly spray or dab on	6–12 hours
Diluted white vinegar	Odour removal	Fine mist-do not soak	12–24 hours

To make a bicarbonate of soda paste, mix 1–2 teaspoons with a few drops of water until it forms a spreadable paste. Apply a thin layer to the affected areas, leave for around 15 minutes, then wipe away with a damp cloth and blot dry. Bicarbonate of soda neutralises odours and offers gentle abrasion without scratching the surface.

An alcohol–water mix (for example, isopropyl alcohol at roughly a 1:1 ratio with water) is particularly useful when germs are the priority-such as after going barefoot in the shoes or if there’s a risk of athlete’s foot. Mist lightly or apply with a cloth, don’t let it drip wet, and allow plenty of ventilation.

Drying properly: where most mistakes happen

The biggest risk after cleaning isn’t the cleaner-it’s drying shoes the wrong way. Putting shoes on a radiator or blasting them with a hairdryer can cause rippling, cracking and adhesive failure.

Direct heat ruins more shoes than any stain-slow drying at room temperature with good airflow is far safer.

Gentle drying, step by step

• Place shoes in a well-ventilated room, not shut in a cupboard.
• Open them up: loosen laces and pull the tongue forward.
• Loosely stuff the inside with newspaper or kitchen roll.
• Replace the paper several times in the first few hours if it becomes noticeably damp.
• After a few hours, tilt the shoes slightly so air reaches the toe box more easily.

A fan or a spot near an open window can shorten drying time significantly. If you have a dehumidifier, position the shoes nearby so they dry in a controlled but gentle way.

Before wearing them again, reach right into the front of the shoe. If the toe area still feels even slightly clammy, wait a few more hours. Moisture trapped inside encourages mould and stubborn odours.

Keeping shoes fresh between cleans

Good everyday habits mean you won’t need deep cleaning as often. Small routines make a big difference.

Daily routines for less odour

• After wearing, don’t put shoes straight into a tight cupboard-air them fully first.
• Use cedar shoe trees: they absorb moisture and help smooth creases.
• Place moisture-absorbing sachets (e.g., silica gel) into heavily used shoes.
• Rotate sports and casual shoes so each pair has time to dry out properly.

Simply alternating between multiple pairs often halves odour issues, because the insoles get enough time to dry completely.

A related tip that’s easy to overlook: socks matter. Breathable, moisture-wicking socks (and changing them promptly after exercise) reduce how much sweat reaches the fixed insole in the first place, which makes every later clean easier and more effective.

Deodorants and sprays: what actually makes sense

Shoe deodorants can help, but they should be functional-not just perfume masking smell. Products with antibacterial action or natural essential oils such as tea tree or eucalyptus target the bacteria responsible for odour.

Important: only spray or powder onto completely dry insoles. On damp surfaces, sticky layers can form-exactly where germs thrive. If you have sensitive skin, test any new product first on a day you’ll wear socks, before using the shoes for longer periods.

If you need a quick refresh when you’re out (for example, travelling or heading from the gym to the office), a light dusting of bicarbonate of soda left in overnight-then tipped out thoroughly the next day-can reduce odour without adding moisture.

When to be cautious-and when a professional is best

With expensive leather shoes and high-quality leather footbeds, inspect closely first. If the material already shows cracking, deep discolouration or lifting edges, use water sparingly. Specialist leather-care products-or a visit to a cobbler-may be the safer route.

The same applies to shoes with complex cushioning systems or an integrated membrane (such as waterproof outdoor footwear). Check the manufacturer’s care instructions: some coatings don’t tolerate certain cleaners or “gentle” household remedies.

For day-to-day needs, though, the essentials remain reliable: a brush, lukewarm soapy water, bicarbonate of soda as an odour killer, and patient drying will bring most fixed insoles back to a state where you can take your shoes off without awkward moments-at the gym, in the office, or at a friend’s house on the sofa.