To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
What can I say? Attach these brushes to a drill (cordless/corded, no matter) and put the business end on the surface that needs cleaning. I used it on my bath tub and it does a WAY better job than I ever could with my scrub brushes. I want to add that I bought this specifically to clean my tiles and my sink and possibly my stove. Those are harder surfaces. I wouldn't put this on a wall, specifically dry wall, and hammer down the trigger.