I have read in other forums that lacquer thinner is the cleaner of choice. Having some self-leveling sealer under the tape seems to be a good idea to moderate the sharp edges of the vents and screws. Silicon, like in many polishing liquids and some caulking, must be removed. An automotive paint store, as Keith mentioned, should be a good source to guide you through that.
I also read that you need to roll it down well.
Thinking seriously about doing mine.