Quick answer: To clean bathroom grout without acid, make a thick paste of baking soda and water, spread it along the grout lines, leave it for 10 minutes, and scrub with a stiff toothbrush. Rinse, then wipe the tiles with a gentle surface cleaner and dry them. Avoid using strong acids on grout regularly, because they slowly dissolve the cement that holds your tiles together. Clean once a week and keep the bathroom ventilated, and grout stays light for years.
You can scrub the tiles until they shine, but if the lines between them are grey or black, the whole bathroom still looks dirty. Grout is the weak spot of every Indian bathroom: wet floors several times a day, a bucket in the corner, little ventilation, and a cement surface full of tiny pores that soak up soap, dirt and moisture. The good news is that you don't need an acid that makes your eyes water to fix it.
Why does grout turn black?
- It's porous. Most grout in Indian homes is cement-based. Its tiny pores absorb water, soap and dirt like a sponge.
- Soap scum. Soap and shampoo react with hard water minerals and leave a sticky film that traps dirt in the grout lines.
- Mould and mildew. Bathrooms that stay damp, especially during the monsoon, grow dark mould in corners and along the floor where water sits.
- Floor traffic. Footwear and wet feet carry dirt into floor grout every day.
Mentioned in this guide
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Why avoid acid on grout?
Many people reach for a strong acid or a toilet-bowl cleaner to whiten grout because it works fast. The trouble is that cement grout is alkaline, and acids dissolve it. Use acid often enough and the grout becomes rough, sandy and recessed, which means it holds even more dirt next time and can eventually let water seep under the tiles. Strong acids also give off harsh fumes in a small, closed bathroom, and they can etch marble or natural stone around the shower. Gentle cleaning more often beats harsh cleaning once a year.
What you need
- Baking soda
- A stiff old toothbrush or a grout brush
- A spray bottle with warm water
- A non-scratch sponge and a microfibre cloth
- A gentle surface cleaner
- Gloves, if your skin is sensitive
How to clean grout, step by step
- Clear the floor and walls. Move buckets, mugs, stools and bottles so you can reach every line.
- Wet the grout with warm water. Dry grout absorbs the paste instead of letting it work on the surface.
- Apply baking soda paste. Mix about three spoons of baking soda with one spoon of water into a thick paste. Spread it along the grout lines with your finger or the brush.
- Wait 10 minutes. Let the paste loosen the grime. This is the step most people skip.
- Scrub along the line, not across it, with short, firm strokes.
- Rinse well with warm water and wipe the residue off the tiles.
- Clean the tiles with a surface cleaner, then dry everything with a cloth.
For very dark grout, repeat the paste once more rather than switching to something stronger. If dark spots remain in corners, they are probably mould. The section below covers that.
How to deal with mould in grout
Black spots that come back within days of cleaning are usually mould growing into the grout. Spray undiluted white vinegar on the spots, leave it for an hour, scrub and rinse well with water. Vinegar is a mild acid, so use it only on the mouldy patches and only occasionally, and keep it off marble and natural stone. If mould keeps returning, the real cause is moisture. Read our guide to dealing with damp, mould and musty smells.
Never mix vinegar, acid cleaners or toilet cleaners with bleach. The fumes are toxic, especially in a closed bathroom.
How to clean bathroom wall and floor tiles
Glazed wall tiles and vitrified floor tiles are easy once soap scum is under control. Spray a surface cleaner, leave it for a couple of minutes, wipe with a damp sponge from top to bottom, and dry. For white chalky marks from hard water on glazed tiles, taps and shower glass, our Tap & Shower Limescale Remover dissolves them in 2 to 5 minutes. It is a mild plant-based acid, so rinse it off well so it doesn't sit on the grout, and don't use it on marble or natural stone. See our guide to removing hard water stains for more. For floors outside the shower area, mop with a pH-balanced floor cleaner.
How to keep grout clean for longer
- Wipe or squeegee the shower walls after the last bath of the day.
- Keep the bathroom dry. Run the exhaust fan, leave the door open after bathing and don't leave a wet bucket in the corner.
- Scrub weekly. Five minutes a week saves an afternoon of scrubbing later.
- Seal the grout. A grout sealer from a hardware shop, applied once a year after a deep clean, makes grout much harder to stain.
- Use less soap. Less soap means less scum on the walls.
Mistakes to avoid
- Using strong acid every time. It whitens grout quickly but wears it away.
- Mixing products. Never combine bleach with acids or ammonia.
- Using a wire brush. It scratches tile glaze and digs into grout.
- Leaving residue behind. Rinse after the baking soda, or a white film will dry on the tiles.
- Cleaning without ventilation. Open the window or run the fan while you clean.
What we use
Our Glass & Multi-Surface Cleaner handles the weekly wipe of tiles, taps and mirrors, and our Plant Based Floor Cleaner is pH-balanced for bathroom and home floors, including marble. For the toilet itself, our Plant Based Toilet Cleaner removes stains without harsh acid fumes. All are 100% biodegradable, independently lab tested and safe for homes with kids and pets. See the combo deals to cover the whole bathroom.
For white hard water marks on taps, showerheads and shower glass, we use our Tap & Shower Limescale Remover, a plant-based spray made with citric and lactic acids.
Frequently asked questions
How do I clean black grout in the bathroom?
Apply a thick baking soda paste to wet grout, leave it for 10 minutes, scrub along the lines with a stiff toothbrush and rinse. Repeat for very dark grout.
Does acid damage grout?
Yes, with regular use. Cement grout is alkaline, and acids slowly dissolve it, leaving it rough and recessed so it holds more dirt.
Can I use toilet cleaner on bathroom tiles?
Strong acid toilet cleaners are not meant for tiles and grout and can damage them. Use a surface cleaner for tiles and keep toilet cleaner for the toilet bowl.
How do I remove mould from bathroom grout?
Spray white vinegar on the mouldy spots, leave it for an hour, scrub and rinse. Then keep the bathroom dry and ventilated so it doesn't come back.
How often should I clean bathroom grout?
A quick scrub once a week keeps grout light. Do a deeper clean with baking soda paste once a month, and seal the grout once a year.
Is baking soda safe on all tiles?
Baking soda is mildly abrasive and safe on ceramic and vitrified tiles and grout. On polished marble, use a soft cloth and a pH-gentle cleaner instead.
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