Chemical Guys スピナーマルチサーフェスドリルブラシ ヘビーデューティー

The stiff bristles on this thing tore through the soap scum on my tub surround in about 15 minutes, far faster than any elbow grease I've put in before. It's a bit aggressive on softer plastic, so I kept the drill on a lower speed, but the results were worth it.

Grout in my shower went from dingy to bright white in about ten minutes with this thing on my drill. The stiff bristles dig in hard but the spinning action does all the work, so my arm isn't dead afterward. Definitely the best $20 I've spent on cleaning gear this year.

The bristles are seriously stiff; it scrubbed years of grime off my bathroom tiles in minutes without me breaking a sweat. The drill attachment stays locked in tight even at high speeds, which I was worried about at first.