Hey guys, a couple of questions for any and or all. I've decided to re-use ALL my glass just because I've heard that the replacement glass isn't as good as the factory and is in good shape but have a couple of questions. 1. What to use to remove the butyl "tar like" substance from the front and rear glass. 2. What did anyone do to polish and take out marks on side glass. Looking to spruce them all up. Thanks!