I'm new to this site, so I thought I would start with a easy question! ( I hope ). I purchased my truck used and it had some tree sap on it. The dealer got most of it off but on one of the fender flares is a one inch stain where it looks like the sap ran. I polished it and got it smooth, but the stain is still there. Do you think it is etched into the clear coat? Is there anything I can do?