Tile and Grout Cleaning: Remove Mould, Stains and Grime
Dirty grout can make a whole bathroom look tired. Learn safe tile and grout cleaning methods, when to call a pro, and how sealing keeps it fresh.
Tile and grout cleaning is the quickest way to make a bathroom, kitchen or laundry look newer without a renovation. The tiles are rarely the problem. It is the grout lines that soak up soap scum, grease and moisture, turning grey, yellow or black over time.
Here is how to clean grout safely at home, how to tell when mould or damage means it is time to call a professional, and how to stop the problem coming straight back.
Why grout gets dirty so fast
Most grout is porous. It acts a bit like a hard sponge, drawing in water, body oils, cleaning product residue and dirt. In bathrooms, steam and poor ventilation give mould and mildew everything they need. In kitchens, grease and food splashes do the same job. After a wet or humid season, many homeowners notice dark patches appear almost overnight.
Cracked, crumbling or missing grout is a different issue. That is not just a cosmetic problem, because water can get behind the tiles.
Safe DIY grout cleaning step by step
- Sweep or vacuum the floor, or wipe the wall, to remove loose dirt.
- Apply a cleaner suited to your tile and grout. A paste of bicarbonate of soda and water works for light staining; a dedicated grout cleaner suits heavier grime.
- Leave it to sit for the time on the label so it can break down the soiling.
- Scrub along the lines with a stiff nylon brush or an old toothbrush. Avoid metal bristles, which can scratch tiles and wear down grout.
- Rinse thoroughly with clean water and dry with a cloth.
Always test on a hidden spot first. Natural stone tiles such as marble, travertine and limestone can be damaged by acidic cleaners, including vinegar, so check what your tiles are made of before you start.
A word on chemicals
Never mix cleaning products, especially bleach with ammonia or acids, because dangerous fumes can result. Ventilate the room, wear gloves and follow the directions on every label. If a product is not suited to your surface, leave it on the shelf.
When to call a professional
DIY is great for routine upkeep, but a professional can be worth it when:
- Grout is deeply stained or discoloured and scrubbing makes no difference
- You have large floor areas, such as a whole kitchen and living space
- Mould keeps returning, which can hint at a moisture or ventilation problem
- You have natural stone or delicate finishes
- You are preparing a property for sale or an end-of-lease inspection
Professionals typically use stronger equipment such as steam or high-pressure rotary cleaning with extraction, which lifts dirt out of the grout instead of pushing it around. Methods vary, so ask what will be used on your tiles.
Grout sealing and colour restoration
Once grout is clean, sealing helps it resist moisture and stains. A penetrating sealer soaks into the grout and slows down the way dirt and water get in. It does not make grout waterproof forever, and it usually needs reapplying every so often, depending on the product and how much use the area gets.
If stains will not shift, some services offer grout colour restoration, which applies a coloured coating over the lines for a uniform finish. It is a budget-friendly alternative to regrouting when the grout is sound but looks stained.
What affects the cost
Prices differ by city and provider, so get a few quotes. The usual factors are the total tiled area, how dirty the grout is, whether sealing or colour work is included, tile type and whether furniture needs moving. Ask for a clear written quote so you can compare like with like.
Questions to ask a tile cleaner
- What method and products do you use on my type of tile?
- Does the quote include sealing, and what sealer do you use?
- How long before I can use the shower or walk on the floor?
- Are you insured, and what happens if a tile is damaged?
Keep grout cleaner for longer
Run the exhaust fan or open a window during and after showers. Squeegee shower walls after use. Wipe splashes in the kitchen before they dry. Clean weekly with a mild, suitable cleaner so grime never gets a chance to settle, and reseal when water no longer beads on the surface.
Key takeaways
- Clean gently, test first and never mix chemicals.
- Repeated mould usually points to poor ventilation or moisture.
- Cracked grout should be repaired, not just cleaned.
- Sealing after a clean makes the next one easier.
Frequently asked questions
Is bicarbonate of soda safe on all grout?
It is mild and works well on many cement-based grouts and ceramic tiles, but always test a small area first, especially on natural stone or coloured grout.
How often should grout be sealed?
It depends on the sealer, the grout and how wet the area is. A simple test is to drip water on the grout, and if it soaks in rather than beading, it is probably time to reseal.
Can black grout mould be dangerous?
Mould can irritate people with allergies or asthma. Light surface mould can be cleaned with suitable products and good ventilation, but widespread or recurring mould is worth having assessed.
Is regrouting better than cleaning?
If the grout is cracked, crumbling or loose, regrouting is the right fix. If it is simply dirty or stained, cleaning, sealing or colour restoration is usually enough.
These cases are perfectly simple and easy to distinguish. In a free hour, when our power of choice is untrammelled and when nothing prevents our being able to do
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