How to Clean Tile Grout on Floors
Grout on floors absorbs dirt, cleaning product residue, and foot traffic grime continuously. Because it's porous and sits in recessed joints that collect everything, floor grout becomes dark and stained much faster than wall grout. Here's what works.
Level 1: Baking Soda and Vinegar (Maintenance Cleaning)
For lightly stained or dull grout that hasn't turned dark yet:
- Sprinkle baking soda directly onto the grout lines
- Spray or drizzle undiluted white vinegar over the baking soda — it will fizz
- Let sit 10 minutes
- Scrub with a stiff grout brush or old toothbrush
- Rinse with hot water
This removes surface grime and mild staining and is safe for all grout and tile types. Good as a monthly routine to prevent buildup.
Level 2: Oxygen Bleach (OxiClean) — For Moderate Staining
For grout that has visibly darkened or turned grey/brown:
- Mix 2 tablespoons of OxiClean (or any oxygen bleach powder) with 2 cups of hot water until dissolved
- Apply to grout lines — a squeeze bottle or brush applicator works better than a spray bottle for targeting grout specifically
- Allow to soak for 20–30 minutes — oxygen bleach needs dwell time to work
- Scrub with a stiff grout brush
- Rinse thoroughly
Oxygen bleach is colour-safe, effective on organic staining (mould, mildew, food), and much gentler than chlorine bleach. It's the best balance of effectiveness and safety for coloured grout.
Level 3: Chlorine Bleach — For Severely Stained White Grout
For white or light grey grout with stubborn dark staining, particularly in bathroom floors:
- Mix 1 part bleach with 1 part water in a squeeze bottle
- Apply along grout lines, being careful not to get bleach on coloured grout (it will strip the colour)
- Leave 10 minutes
- Scrub and rinse thoroughly
- Ventilate well — chlorine bleach fumes accumulate in bathrooms
Never use chlorine bleach on coloured grout or on marble/natural stone tiles.
Level 4: Professional Steam Cleaning
For heavily soiled grout that doesn't respond to DIY methods, professional steam cleaning uses pressurized steam to open the pores of the grout and lift deeply embedded dirt. Many Toronto cleaning companies offer grout steam cleaning as an add-on service.
Sealing Grout After Cleaning
Once you've cleaned the grout, seal it. Grout sealant fills the pores, preventing future staining and making routine cleaning much easier. Apply with a small brush along grout lines. Wait 24 hours before exposing to water. Re-apply annually or when water stops beading on the surface.
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