I'm unsure if I'm doing something wrong, but I purchased the CA Jelly Blade a few months ago. I've used it several times -- on 3 cars now. Sometimes mine leaves rubber scuffs on the paint. I'm not applying pressure -- just gliding across the top. I mainly use it for the hood, roof, and glass. I'm thinking maybe there's not enouch water -- since I'm also using the "waterfall" hose method? I was thinking of returning the product, but I do not have the original package. I kept the instructions, and it only states a 30 day warranty through the manufacturer (lame). Any thoughts are appreciated. I stll have the receipt -- purchased from Target (90 day return policy).