I purchased block blitz outside cleaner. This product does not do what it says and also has lifted the paint from my decking which was perfectly sound until I applied the block blitz where you could see it the very next day peeling off. It doesn't work either on the drive and block paving where it has just left stains. I rang QVC and because I have used it all except for one bag they have refused me a refund. The product doesn't work so therefore I am not satisfied with it, how else are you supposed to know if it has worked only by using it. VERY ANGRY. QVC says try it if you're not satisfied get a full refund?? Not the case they have refused me a refund because I have used most of it ?? Very Disappointed customer.