The GN I recently bought has a few small sections that are on the rocker panels which looks like flat black paint. It looks like one of the previous owners tried touching up with a dull flat black. I have used a Zymol product that strips similar to a clay bar and this is doing the job but extremely slow. Is there something else, maybe a rubbing compound that might work better? The strange thing once I started getting the dull flat black paint off is there is nothing wrong underneath this. Why woud someone paint dull flat black on the rocker panels and spots on the lower doors?