The white is a soft bristle, best for wheels, carpet, upholstery, glass, and leather; the yellow is a medium bristle, best for bathroom, bathtub, shower, tile, and porcelain; the green is a medium bristle, best for kitchen, stoves, cabinets, countertops, and linoleum; the blue is a medium bristle, best for boats, pools, canoe/kayaks, hot tubs, and plastics; the red is a stiff bristle, best for outdoors, siding, brick, garage, and gutter; and the black is a hard bristle, best for grills, loose paint, furnaces, ovens, and industrial use. 

Additionally, Drill Brush is a small business based in New York!

Promising review: “I’ve been eyeing these for a few months and finally caved. Man do I regret not picking them up as soon as I saw them! They work GREAT! We rent an apartment that has a 30+ year old shower/tub. I’ve used everything from abrasive powders, gels that sit to most recently the bathroom Magic Erasers and nothing really got the grime out. These WORK and they work fast. Just 10 minutes with my handy drill and the shower has never been cleaner. I love that I don’t have to throw money out on cleaning products anymore and that I can be a little more environmentally friendly with no waste and no chemical cleaners! Just a little dish soap, baking soda and a spin of the brush. If you’re on the fence, just buy them!” —Becky Adie

Get it from Amazon for $18.95 (available in six strength types).