A good electric spin scrubber could help you clean up way easier and less tiring. Superpower 3.7V 4000mah increases speeds up to 300RPM and 35.4 kg.cm. Upgrade the current to 12A to withstand higher resistance and reduce approximately half of the issues caused by resistance. The depth of the bristle is more than 7mm, repeated practical use turns out not easy to shed and won't leave any scratch. Application 4 multi-purpose brush heads: Extra-wide flat brush for hard floor, tile, wall, door, window, glass, patio furniture, pool Small flat brush for the shower, kitchen, grease, stove, grill Comer round brush for curved surface, bathtub, sink, baseboard or toilet Pointed brush for tile grout, edges, corners, cranny and tight places.