Pre-Tac Prep Solution Preparation Solution and Glass Cleaner Pre-Tac is a specialized preparatory solution for priming glass surfaces prior to window film installation, proficiently reducing surface oils and contaminants, creating an immaculate foundation for window film installation, and additionally serving as a streak-free glass cleaner. All-in-one prep solution and glass cleaner Degreases and removes surface contaminants Degreases and removes surface contaminants Safe for all types of window film Directions Pre-Tac is not a concentrate. Pre-Tac is premixed and ready for use. Pre-Tac is sufficient for removing oils and contaminates from glass surfaces when used with a nylon scrub pad. This will help break the surface tension of these individual oils before scraping.