How to Clean Grout Lines on Tile Floors
Tile grout becomes discoloured over time from dirt, grease, mildew, and mineral deposits that accumulate in the porous grout material. Standard mopping moves the dirt without removing what has already embedded itself into the grout. These methods penetrate and remove discolouration from the grout itself.
Method 1: Baking Soda + Vinegar Paste
- Make a paste with baking soda and a small amount of water (thick, not liquid)
- Apply the paste along the grout lines using a stiff-bristled brush or old toothbrush
- Spray white vinegar over the baking soda — it will fizz, which helps loosen dirt
- Allow 5–10 minutes
- Scrub along the grout lines with the brush — work in short sections
- Rinse with warm water and mop dry
Method 2: OxiClean Soak (Best for Floor Grout)
- Mix OxiClean with warm water according to the directions
- Apply to the tile floor and work into the grout lines
- Allow 20–30 minutes of contact time — the oxygen bleach breaks down organic staining
- Scrub grout lines and rinse thoroughly
- This is very effective for mildew-stained grout in bathrooms
Method 3: Commercial Grout Cleaner
- Products like HG Grout Cleaner, Grout-Eez, or Zep Grout Cleaner are acid or enzymatic formulations specifically designed for grout
- Apply as directed, allow dwell time, scrub, and rinse
- These are the most effective for heavily discoloured grout
Grout Sealing
After deep cleaning grout, apply a grout sealer to protect against future staining. Sealer penetrates and closes the porous surface, preventing dirt and mildew from embedding. Apply with a small brush along the grout lines, allow to cure per the product instructions, and buff excess from the tile surface.
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