So I was riding down the road yesterday and a plastic bag flew out from under a car and got sucked under my bike. It got caught up for a minute underneath and then popped out. After parking the bike, I noticed I had a nice spot on my exhaust pipe where the plastic had melted. It is in a very noticable spot, so I'm not really sure about the best way to get it off. Scraping will be sure to leave marks.... any ideas?