bummer, man. I just noticed some [more] paint issues with my '93 tonight also. I've only owned luminas, so I don't know if other makes/models have the same issue with holding dirt/debris. I think MaxWedge is right. These cars have so many places to hold dirt, sand, salt, etc. that it's hard to remove all of it...leading to problems such as yours. I know my '93 has LOTS of hiding places. In the wheel well for instance, dirt gets flung up on the small ledge and won't leave on its own. Also the inside door jambs seem to collect lots of dirt. Whenever I wash the luminator, I always open the doors to find some nice mud on the rocker panels...umm umm NOT GOOD. I guess the "draining system" on that car isn't too good. After a wash there is also a lot of water inside the mirrors as well as around the hinges of the doors/trunk. I always have to go through and dry the inside as well. It's a lot of extra work, but you gotta try. Good luck man in whatever you do! BTW. Just noticed that it's below the fuel door. Do you think that gas overflow (from filling) could be the culprit?