I second the Sprayway brand. I use it on the Lexan/Plexiglass R-Model rear
window of the mustang and it does and excellent job on that and on the
windshield. I have had good result with that and BLUE paper towels, the Scott
Garage/Shop brand. They carry the Sprayway brand at Costo as well, comes in a
3 pack. It's a nice foam when it comes out.