I'm trying to stop a leak that I think is coming from the windshield of one of my cars, and I was using black silicone sealant. It's virtually impossible not to get some of that stuff smeared on the glass, and I'm wondering what is the best thing to use to remove the excess? I have been waiting until it dries and then scrape it off with a razor, but I'm not sure if that's the best way. Mark