We bought a house where I don't think the previous owners had cleaned their shower screens often and after trying everything from toothpaste, vinegar, CLR, many shelf products etc I was amazed at the success of Shower Hero. It can be tiring to polish continually for half an hour with a drill, but I felt the results were outstanding and saved us buying new screens. I would certainly recommend this product to remove much of the grime, scale, built up scum and clouding of shower glass.