Household cleaners should not be mixed indiscriminately. In particular, never combine bleach with vinegar, ammonia, or other cleaning products because dangerous fumes can be produced.
If you have previously used another chemical cleaner on the floor, rinse the surface thoroughly before trying a different product.
Removing the black residue is only part of the solution—the way grout is maintained afterward can determine how quickly the discoloration returns.
How to Keep Grout Cleaner for Longer
Once the grout has been cleaned, a few simple habits can slow down the return of dark stains.
Clean Spills Quickly
Oil, sauces, beverages, muddy water, and other spills can penetrate porous grout if they remain on the floor for too long. Wiping spills promptly helps prevent them from becoming deeply embedded stains.
Vacuum or Sweep Before Mopping
Mopping a dusty floor can push wet dirt directly into grout lines. Remove loose dust, hair, crumbs, and debris first with a vacuum cleaner or broom, then mop the floor.
Change Dirty Mop Water
