Without Relying on Strong Cleaning Products

Do Not Mix Different Cleaning Products

Household cleaning products should never be mixed indiscriminately. In particular, never mix bleach with vinegar, ammonia, or other cleaning products, as this can produce dangerous fumes.

If you have already used another chemical cleaner on the floor, rinse the surface thoroughly before trying a different product.

Removing black residue is only part of the solution. Maintaining the grout afterward can determine how quickly the discoloration returns.