How to clean tile grout

Grout lines between tiles get dirty quickly, especially in bathrooms, kitchens and terraces. Because grout is porous, it absorbs moisture, soap, grease and dust, leading to dark stains and even mould. This guide describes the most effective cleaning methods and when it is best to rely on a professional stripping and polishing service, such as the ones Net i Pulit has been providing since 1994.

Why tile grout gets so dirty

Grout is highly absorbent, which causes it to retain:

• soap scum and limescale in bathrooms

• grease and food residues in kitchens

• dust and moisture in outdoor areas

• mould in poorly ventilated spaces

The result is a floor that looks aged, dull and difficult to maintain.

Recommended products for cleaning tile grout

Baking soda and vinegar

A simple and surprisingly effective combination for moderately dirty grout.

• Mix baking soda with water to create a paste

• Apply directly to the grout lines

• Spray vinegar over the paste

• Let it sit, then scrub with a brush

Scented ammonia

Very useful for kitchens and terraces.

• Dilute it in warm water

• Apply with a stiff brush

• Rinse thoroughly to remove any remaining odour

Bleach (for white grout only)

Very effective on white grout but not suitable for delicate surfaces.

• Apply diluted bleach

• Allow it to act for a few minutes

• Rinse with plenty of water

Professional descaling products

At Net i Pulit we use industrial-grade descaling and deep-cleaning products that remove mould, stubborn stains and deeply embedded dirt without damaging the tile or grout.

How to clean tile grout step by step

1. Remove surface dirt

Sweep or vacuum the floor for better product penetration.

2. Apply the cleaning product

Ensure the product fully covers each grout line.

3. Scrub thoroughly

Use a stiff brush or an old toothbrush for best results.

4. Rinse with warm water

Wash away product residue and loosened dirt.

5. Dry the surface completely

Prevent moisture buildup that can cause mould.

When to rely on a professional service

If the grout is extremely dark, stained or the floor has lost its natural shine, domestic cleaning is usually not enough.

Net i Pulit offers:

• floor stripping to remove old dirt layers, worn waxes or embedded grease

• professional polishing and brightening to restore the original look of the floor

• deep cleaning services for porous surfaces, bathrooms and kitchens

• aesthetic restoration for heavily deteriorated grout lines

Our specialised treatments can recover floors that seem impossible to restore.

Tips to keep grout clean for longer

• ensure proper ventilation in humid areas

• avoid soap or water buildup

• clean grout every 15–30 days

• use mild disinfectants for maintenance

• apply a grout sealer if dirt builds up frequently

Frequently Asked Questions (FAQs)

What is the best product for very dark grout?

Professional descaling products. For white grout, baking soda with diluted bleach can also help.

How often should grout be cleaned?

Every 15–30 days for optimal maintenance.

Is steam cleaning effective for grout?

Yes, steam disinfects and lifts surface dirt, though it may not remove deep stains.

Can very old grout be restored?

Yes, with professional stripping and polishing services the appearance can be greatly improved.

Want to restore your tiles to their original look or need professional stripping or polishing services? Net i Pulit delivers impeccable results throughout Barcelona, Sant Cugat and the Vallès, backed by more than 30 years of experience.

Request your quick quote here