I just replaced my bottom window seals after 10 years but unfortunately they had degraded terribly, even lost three speakers which is a different subject, but the degraded seals, front passenger even melted a bit, left stripes down both fr & r passenger side windows. I have tried glass cleaner, Dawn dishwashing liquid, and a little bit of alcohol on a test spot. none of these things serve to do anything but smear whatever this residue is. Any ideas? Thanks!