Afternoon. P85D sat in hot sun for prolonged time. Shortly after, I rolled up the back right window which was the most exposed and two streaks of black 'tar' showed up. Searching a bit, I understand this would be excess butyl rubber from within the window assembly. How do folks suggest I clean this? I do not want to damage the window obviously. Regular car window cleaner was my first thought but the stuff seems pretty sticky. Perhaps bug and tar remover? Other thoughts? Thanks.