Removing them is a gooey mess. You will need to remove the quarter window interior trim panels to access the speed nuts that attach them. The chrome trim around the window has studs on the back that are held in by speed nuts and that's what removes them. But wait....there's more. When you take them out, there will be a sticky black sealer that will get everywhere, so mash off the glass completely ( both sides)and the quarters to catch it all and reduce cleanup afterwards. You will need to scrape as much off as possible before removing the tape, then go to town with either adhesive remover of lacquer thinner. After all the goo is removed, you can remove the tape and reseal it with butyl windshield tape. Don't use urethane as the window will never come off. Use Butyl and you'll be ok.