Rapid Clear is the perfect end to a job well done and will make your work look it's best. Easily clean and polish plexiglass, glass, auto paint and most polycarbonates, while leaving a luster that is sure to impress. Rapid Clear is the perfect end to a job well done and will make your work look it's best. Easily clean and polish plexiglass, glass, and most polycarbonates, while leaving a luster that is sure to impress. Use Rapid Clear as a final cleaning for your sign work, auto restoration, etc. Rapid Clear is Non-Hazardous Non-Flammable and Bio-Degradable. Step 1. Spray Rapid Clear on surface to be cleaned. Step 2. Using a soft scratch resistant cloth, or paper towel, wipe or polish until surface is dry.