Why grout stays grey
Grout is porous. Soap scum, body oils and hard-water minerals soak into it and set. A cloth wipes the surface and leaves the dirt inside the joint, which is why a floor can look clean and the grout lines still look dirty.
Getting it out needs two things a cloth cannot give: stiff bristles that reach into the joint, and enough mechanical action to lift what has bonded to the surface.
Two heads, two jobs
- Wide stiff-bristle head — runs along a grout line and covers the joint in one stroke. The angled handle keeps your knuckles off the tile.
- Narrow detail head — for the places a wide brush cannot enter: tile corners, the base of taps, window tracks, the seam where the floor meets the skirting, and the rubber seal around a shower door.
How to clean grout so it stays clean
- Dry-brush the line first to lift loose dust. Doing this wet just makes mud.
- Apply your cleaner and let it sit for the dwell time on the label. Most people scrub immediately and rinse it off before it has done anything.
- Work along the joint, not across it, with short strokes.
- Rinse and dry. Standing water is what grows the black mould that turns grout dark again.
What it will not do
This is a cleaning brush, not a restoration tool. If the grout has eroded below the tile edge, or the discolouration is mould growing inside the joint rather than dirt on the surface, brushing will not fix it — the joint needs raking out and re-grouting. Be realistic about that before you spend an afternoon scrubbing.
Where it is most useful
Bathroom floor grout, kitchen splashback lines, the silicone seam behind a sink, shower door tracks, and the aluminium runners of sliding windows — anywhere grime collects in a channel narrower than a sponge.
Frequently asked
Will stiff bristles scratch tiles?
No on ceramic, porcelain and glazed tile. Take care on polished natural stone and on brushed metal, where a stiff bristle can leave a mark — test a hidden corner first.
Can I use it on a glass hob?
Use the detail head around the edge only. Do not scrub the glass surface with stiff bristles.
Tile Grout & Crevice Scrub Brush - Dual Head Stiff Bristle Cleaner with Detail Brush
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