How to cut out quarter windows for 88 Toyota Supra?

Method 1: Cut the top before you install. Then install and squeegee out the water - but not all the way to the sides yet. Using just a tiny bit of blade, cut around the sides. Take a card and force the water out and dry off with a paper towel.   Method 2: You can also pull the rubber off completely. This will probably expose black goop depending on how old the model is, and you will have to clean it up the best you can. Once you’ve removed the black stuff, it will be easier for a clean cut and install.