Acceptable cleaners are Fantastik, Formula 409, Windex, Glass Plus, Clorox Cleanup w/bleach, Isopropyl Alcohol, Virex Tb, Clorox disinfectant wipes or liquid detergent with water solution mixture. Use a lint free nonabrasive cloth to wipe down the face of the sign. No scrubbing or abrasive material is to be used as this may damage the surface of the sign