Where possible use the disposable visor tear offs to protect the visor surface. If paint and other material has to be cleaned from the visor, the use of solvents (such as all-purpose thinners) should be diluted and used with a soft cloth. Dampen the cloth with solvent to briefly wipe the surface and quickly wiped off with a clean cloth. Do not leave solvents on the surface or to soak. WARNING NOTE: The visor material is polycarbonate. AVOID solvents not compatible with polycarbonate: Ethyl acetate, benzene, sodium hydroxide, nitric acid, sulphuric acid and chloroform. These chemicals can cause the visor to cloud up or become brittle and fracture.