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How do I clean and store Grout Brush?Updated 3 days ago

TL;DR: Rinse Grout Brush bristles in warm water after each use, squeeze gently, then air-dry bristles-up. Store it somewhere dry, out of direct sunlight and away from high heat. Do not soak it.


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Koh Grout Brush bristle detail
Koh Grout Brush

How do I clean and store Grout Brush?

Run warm water through the bristle bed to flush out dirt and cleaner residue, press the bristles gently to squeeze the water out, then stand Grout Brush on its back edge or hang it by Grout Brush Pole so air circulates around the bristles. Once it is dry, store it somewhere dry and shaded, out of direct sunlight and away from high heat. Do not soak it and do not put it in a tumble dryer.

The routine after every use

1

Rinse warm. Run warm water through the bristle bed to flush out dirt and cleaner residue.

2

Squeeze gently. Press the bristles to push the water out. Do not twist or wring.

3

Air-dry bristles-up. Stand the brush on its back edge or hang it by Grout Brush Pole so air can circulate.

Can I soak Grout Brush?

No. Leaving Grout Brush submerged in water or cleaner solution can warp the plastic and soften the polybutylene terephthalate (PBT) bristles, which shortens their useful life and spoils the angled bristle cut that gets into grout channels. A quick rinse and an air-dry after each use is all the cleaning the brush needs.

⚠ Do not soak

Left submerged, the plastic can warp and the polybutylene terephthalate (PBT) bristles soften and splay. That spoils the precise bristle angle that bites into grout channels. Rinse only.

Warps bristles Spoils the angle

✓ Rinse and dry instead

A short warm rinse through the bristle bed, a gentle squeeze, then a bristles-up air-dry. That is the entire care routine.

Quick rinse Air-dry bristles-up

How should I store Grout Brush?

Once it has air-dried, store Grout Brush somewhere dry. Keep it out of direct sunlight and away from high-heat spots such as windowsills, above radiators or hot cupboards next to an oven. UV and heat break down the bristles over time, so a shaded cupboard, utility drawer or cleaning caddy is the best home for it. Avoid sealing it inside a damp plastic bag.

✓ Best storage spots

A shaded cupboard, utility drawer, cleaning caddy or laundry shelf. Anywhere dry and out of direct sunlight keeps the bristles straight and strong.

Dry Shaded Ventilated

⚠ Where not to keep it

Direct sunlight, a hot windowsill, above a radiator, next to an oven, in the car boot, or sealed inside a damp plastic bag. UV and heat degrade the bristles over time.

No direct sun No high heat No sealed bags

When the bristles splay or flatten past the point of reshaping, it is time for a new one. See How long will Grout Brush last?

Koh Grout Brush

Grout Brush

Grab a fresh one when the bristles splay or flatten beyond reshaping.

Koh Grout Brush Pole

Grout Brush Pole

Hang Grout Brush off it to air-dry, and use it as a standing-scrub handle for floor grout.

Browse all Grout Brush articles

Last reviewed: August 2026 · Koh UK

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