Come on! Give the dude a break. When I was a kid my dads Buick's rear bumper rusted up in the Indiana winter salt. He gives me a can of chrome polish and tells me to make it shiney again. Let me tell you....this rust was determined to not come off. I butter fingered the rag ;and dropped it in the fine gravel of the driveway and all of a sudden the rust started disappear. Wha La! All I needed was something more abrasive. A lesson I never forgot.