Oxygen bleach is the most effective grout cleaner for most stains.

  1. Mix oxygen bleach powder (like OxiClean) with warm water per label directions.
  2. Apply to grout lines with a brush or squeeze bottle.
  3. Let sit 15 to 30 minutes. The oxygen ions break down stains at the molecular level.
  4. Scrub lightly and rinse with warm water.

This works on nearly all grout stains without the fumes or surface damage of chlorine bleach.

For maintenance between deep cleans: spray grout lines with a diluted all-purpose cleaner weekly and wipe when you clean the tile surface. Prevention requires far less effort than restoration.