Time to ask the Autopians. I'm having trouble removing overspray on the windshield of my wife's Tacoma. ( I'm 500 miles from the body shop that did the repair so returning to the shop is not an option.) I have used both Clay Magic Fine Grade Clay (blue) and Meguiars Body Shop Professional Overspray Clay (white). The Meguiars is pretty old but it is pliable and seems to be in good shape. Neither clay worked. I have ordered some Meguiars Professional Detailing Clay G-2100 ("aggressive"). If this doesn't work, what next? A friend of mine who owns a pro-detailing shop suggested steel wool and window cleaner. I'm a bit leery of trying this.