Review on Ultimate BBQ Tool Set: Grill Brush, Scraper, Rust & Grease Remover - BBQ Accessories for Electric Smokers & Gas Grills - Stiff Bristles - Grill Cleaner + Bonus Graffiti Remover by Jennifer Wilson

Brushed grout on travertine floors. For use with a concentrated mixture of mr clean and water. Works just as well as expensive cleaning products. You should have either a 110V drill or a good quality cordless drill with a lithium ion battery. The red brush isn't actually that much harder than the yellow (medium) brush, which covers an area of about 2000 square feet at a time. The brush saved me about $2,000. Indeed!