Discolored grout can be frustrating, but a stronger or more complicated homemade mixture is not a substitute for a suitable cleaning method. Start with the care instructions for your tile, grout and any sealer, along with the cleaning product’s label.
Is hydrogen peroxide suitable for your grout?
Do not assume that hydrogen peroxide is appropriate for every tile, grout or finish. This article does not prescribe a peroxide concentration, soaking time or homemade cleaning formula. Use a product only for a use permitted by its label and the surface manufacturer’s care instructions.
Never mix vinegar and hydrogen peroxide
Do not combine vinegar with hydrogen peroxide in a bucket, spray bottle or other container. The combination can form corrosive peracetic acid. Do not mix household cleaning products or improvise combinations to make a cleaner stronger.
Earlier versions of this page included a vinegar-and-peroxide mop mixture. That instruction has been removed and should not be followed.
Choose care instructions for the whole surface
Before cleaning, identify the tile, grout and any finish or sealer. If the materials are unknown or their care instructions are unavailable, ask the manufacturer, installer or a qualified tile-care professional before selecting a chemical cleaner.
Follow the product label for use and any rinsing or protective-equipment directions. Do not replace the label’s directions with a generic recipe or time listed online.
Ongoing maintenance
Use the maintenance and sealing schedule recommended for your specific installation. If discoloration persists or you cannot identify its cause, seek material-specific advice rather than repeatedly applying different chemicals.
Cleaning advice is not a claim that a surface has been disinfected. This page does not promise mold removal, germ elimination or a particular degree of whitening.
