Have you ever scrubbed your bathroom floor until your arms hurt, only to find that the grout between your tiles still looks dark and dirty? You’re certainly not alone! Bathroom grout can gradually turn grey, brown, or almost black because of soap residue, dirt, moisture, and mould.
Looking at the photo, the grout appears particularly dark along the tile joints and where several lines meet. The good news is that dirty grout can often be cleaned and brightened without replacing it, although the best method depends on whether the discolouration comes from surface dirt, mould, or damaged grout.
Here are seven practical ways to tackle the problem, step by step.
1. Start With Warm Water and Dish Soap
Before reaching for stronger cleaning products, try removing the surface dirt first.
What you’ll need:
- Warm water
- A few drops of washing-up liquid
- A soft nylon grout brush
- A microfibre cloth
Step-by-step instructions:
- Sweep or vacuum the floor to remove loose dust and hair.
- Mix a few drops of washing-up liquid into a bowl of warm water.
- Apply the solution to the grout lines.
- Gently scrub with a nylon brush, concentrating on the darkest areas.
- Wipe away the loosened dirt with a clean, damp cloth.
- Rinse with clean water and dry the tiles.
This method is a good starting point for ordinary bathroom grime and is less likely to damage grout than aggressive scrubbing.
2. Try Baking Soda for Stubborn Surface Dirt
If ordinary soapy water doesn’t remove the dark marks, baking soda may help lift surface grime through gentle abrasion.
You’ll need:
- Baking soda
- A little water
- A soft nylon brush
How to use it:
- Mix baking soda with a small amount of water to form a thick paste.
- Test the paste on a small, inconspicuous area first.
- Apply a thin layer to the grout.
- Leave it for approximately 5–10 minutes.
- Gently scrub the grout with a nylon brush.
- Wipe away the paste and rinse thoroughly.
Avoid using excessive pressure, especially if the grout is old, crumbling, or cracked.
Important: Baking soda is not a disinfectant and may not remove established mould or deep staining.
3. Use an Appropriate Grout Cleaner
Sometimes, the simplest solution is a dedicated grout cleaner.
Choose a product that is suitable for your particular grout and tiles. Some cleaners are designed for ordinary dirt, while others are formulated to tackle mould or mildew.
Follow the label carefully, including the recommended contact time and rinsing instructions.
Always test the cleaner in a small area first, particularly if your tiles are natural stone.
Never mix cleaning products. In particular, mixing bleach with vinegar, acidic cleaners, ammonia, or other incompatible products can release dangerous gases.
4. What If the Grout Has Black Spots?
See more on the next page
