I get marks off the pipes on my Harleys using "Mr. Clean Eraser Pads". It was the wife's idea and it works great. I had a Thunderheader on my Dyna that melted my boot in a rain storm (I was tucked right in trying to keep warm) and the rubber from the boot sole was burned on bad. I tried everything I could think of for two years and one day my wife strolled into the garage with one of the Mr Clean pads and wiped it totally off.