How to Clean Tile Grout: A Complete Guide for Bathrooms, Kitchens and Floors

Dirty grout makes even a brand new tile floor look tired. The lines between tiles trap soap residue, soil, mildew and mineral deposits, and once it darkens it stays that way until you actively scrub it back. The good news: grout responds well to the right tools and a steady routine. Here is how to bring tile lines back to their original colour.

Why grout gets so dirty

Cement based grout is porous. It absorbs liquid, holds onto soap film and feeds mildew in showers and bathrooms. Floor grout collects mop water grime that mops actually push deeper into the lines instead of removing. After a few months without targeted cleaning, the grout reads as a shade or two darker than the day it was installed.

Tools you actually need

• Stiff bristle grout brush — narrow head fits the lines
• Steam cleaner with a detail brush — see our steam cleaner collection
• Oxygen bleach or alkaline grout cleaner
• Microfiber cloths and a wet vac for rinse water
• Knee pads if cleaning floors

Step by step

1. Sweep or vacuum loose dirt off the tile
2. Mix oxygen bleach into warm water at the label rate
3. Pour onto the grout lines and let it dwell 10 minutes
4. Scrub each line with the grout brush, working in 4 foot sections
5. Run a steam cleaner across the lines if available, otherwise rinse with clean water
6. Pick up rinse water with a wet vac or clean microfiber
7. Allow to dry fully before walking on it

Steam vs chemical cleaning

Steam reaches into pores that brushes and chemicals miss, and it does the work without leaving residue. For badly soiled grout, chemical pre-treatment plus steam gives the deepest result. For light maintenance, steam alone is enough. A handheld steamer with a wire detail brush is one of the fastest ways to keep grout fresh between deep cleans.

Removing stubborn stains

Mildew in shower grout responds to oxygen bleach and a soft scrub. Grease in kitchen grout needs an alkaline degreaser. Iron and rust stains need an acidic cleaner, but never use acid on natural stone tile. Always test in a hidden spot first when using anything stronger than a neutral cleaner.

Sealing after the deep clean

Once the grout is dry, apply a penetrating grout sealer with a small foam brush along each line. Two coats give the best protection. Sealed grout repels water, soil and stains for 12 to 18 months and makes routine cleaning much easier.

Maintenance routine

Spray a neutral pH cleaner on shower walls after each use and squeegee dry. Damp mop floor tile weekly with a fresh cleaning solution rather than reused water. Run a steam pass over floor grout once a month. With this routine, grout stays clean for years.

Frequently asked questions

Can I use vinegar on grout?

Avoid vinegar. It is acidic and erodes cement based grout over time. Use oxygen bleach or a neutral grout cleaner instead.

How often should I deep clean grout?

Every 2 to 3 months for shower grout, every 4 to 6 months for kitchen and floor grout, depending on traffic.

What is the fastest way to clean a whole tile floor?

An autoscrubber with a tile brush followed by a steam pass on the grout lines. For homes, a handheld steamer with a detail brush is the practical choice. Browse our floor care equipment for the right tool for your space.