I used the black bristle brushes on a toilet and it worked great. I had a lot of calcium buildup in the toilet and they cleaned the bowl really well.My husband uses it in his car upholstery, worked greatI bought these hoping to restore my cloth seats in my car and they worked great! 10/10Worked great burn I wish they had stronger bristles.Easy to change out brushes in my drill, the extension helps my back from bending over so much, cleans fast and well, and they are easy to clean and put away themselves in the bucket provided.It's easy to use. It didn't take off ALL the stains in my tub, but it really made a difference. Maybe if I could find the right cleaning product for the cheap tub I own,it would work 100%. It's fast cleaning, compared to all my elbow grease. I would definitely recommend it for anyone who hates scrubbing as much as I do.I love them. Well worth it. They work good so so many things.My husband and I have bought so many cleaning kits and sprays just to keep our counters clean over the years for our counters that have small tiles and grout. Nothing has ever helped until my husband ordered the ProSMF. It has been fast and easy to use. Just make sure if you use a cordless drill it’s charged before using your kit. I was able to use any cleaning solutions we had at home finally that worked well along with the brushes. The different size brushes are awesome for hard to get areas!Un gran set de productos con todo los necesario para hacer juego con el taladro o destornillador electrónico, te facilita el trabajo un 100%, la cubeta transportadora, una extraordinaria idea para mantener las cerdas en condiciones ideales