Plus Glass Cleaner for Vehicles from Penray comes as an ammonia-free product that can clean debris that's not common to household windows. Bugs, tar, road film, car wash residue, evaporated haze from vinyls used in dash boards and upholstery, tree sap – all of these substances collect on vehicle windows, and all tend to be resistant to general-purpose cleaners. The product leaves a finish free of film, streaks, and residue – all of which can cause annoying distortion for motorists.