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Always test first! Your grout should withstand the occasional use of diluted bleach. One cup of bleach, mixed with one gallon of clean water, is usually sufficient for disinfecting. Regular use can discolor and weaken grout over time. Bleach should only be used when absolutely necessary and should never be used for routine maintenance of stone, tile and grout. For most installations and applications, the use of an appropriate cleaner, such as MAPEI's UltraCare Concentrated Tile & Grout Cleaner for floors, or UltraCare Everyday Stone, Tile & Grout Cleaner; UltraCare Everyday Stone Clean & Polish; and UltraCare Everyday Stone & Grout Cleaner & Resealer for countertops and backsplashes, is recommended routine maintenance.
Technical Services at 1-800-992-6273
Customer Service at 1-800-426-2734 (1-800-42-MAPEI)