How To Clean Grout?
QUICK ANSWER
Mix baking soda with hydrogen peroxide into a paste. Apply to grout lines, let sit 10 to 15 minutes, scrub with a stiff brush (toothbrush for detail), rinse with clean water. For stubborn or black grout, use oxygen bleach (OxiClean) solution. Seal cleaned grout to prevent staining.
Grout collects dirt, soap scum, and biological growth more than any other floor or shower surface because the rough, porous texture traps everything. Clean grout transforms tile appearance dramatically; dingy grout makes even high-end tile look dated. The right approach combines a mild abrasive with an oxidizing cleaner. The wrong approach (bleach, acidic cleaners) damages the grout itself. Here is the method that actually works.
Why is grout so hard to clean?
Grout is porous concrete that absorbs everything: oils, dirt, biological growth, soap scum. The texture creates microscopic ridges where dirt embeds. Most grout is sealed when first installed but the sealer wears off in 1 to 3 years, leaving the grout vulnerable. Custom Building Products (a leading tile and grout manufacturer) notes that proper maintenance includes neutral pH cleaners and periodic resealing; harsh cleaners damage the cement-based grout itself. Common mistakes: bleach degrades the grout polymer, acidic cleaners (vinegar) etch the cement matrix over time, abrasive scrubbing wears down the surface. The right approach is gentle but persistent.
What is the basic cleaning method?
Start with the gentlest effective approach. Mix the paste: 3 parts baking soda to 1 part hydrogen peroxide (3% drugstore strength); should be the consistency of toothpaste. Add a small amount of dish soap if grout has greasy buildup. Apply to grout lines with a small brush or spoon; cover the grout completely. Let sit 10 to 15 minutes; longer for stubborn dirt. Scrub with a stiff-bristle brush (grout brush, toothbrush, or stiff nylon brush); work in small sections. Rinse with clean water and a sponge. Dry with a microfiber towel. For typical floor or wall grout that's not severely stained, this method works well.
How do you handle severely stained grout?
For grout that's turned black, brown, or won't respond to basic cleaning: oxygen bleach is the professional choice. Mix OxiClean Versatile per package directions; create a paste with minimal water. Apply to grout. Let dwell 30 to 60 minutes (don't let dry; mist with water if needed). Scrub vigorously. Rinse. Commercial grout cleaners (Polyblend Grout Renew, Aqua Mix Cleaning Solutions, Zep Grout Cleaner & Whitener): formulated specifically for stubborn grout; follow product labels exactly. For extremely stained grout: grout colorant or grout paint (Polyblend Grout Renew) covers the existing color and provides a fresh-looking surface; this is what many professionals use rather than continued aggressive cleaning.
How do you keep grout clean?
Prevention beats removal. Seal grout with a quality sealer (TileLab, Aqua Mix) every 1 to 3 years. Sealed grout resists stains and cleans easily with mild soap. Daily: squeegee shower walls; wipe tile spills immediately. Weekly: mop with a tile and grout cleaner. Avoid daily vinegar (acid degrades grout), bleach (degrades polymer), and abrasive tools. With sealing and gentle cleaning, grout stays fresh for years.
Grout cleaning works best with gentle but persistent methods: baking soda and hydrogen peroxide paste for typical dirt, oxygen bleach for severe stains, commercial cleaners for extreme cases. Sealing after cleaning is essential to maintain results. Avoid the damaging products (bleach, vinegar daily, abrasive scrubbing) that degrade grout faster than they clean it. For very old or damaged grout, regrouting or grout colorant produces better results than continued aggressive cleaning.
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