Most of the signs we sell can be cleaned with a just water. For stubborn spots a mild detergent and a soft cloth are recommended. Stay away from anything abrasive, as it may scratch the surface of the sign, the exception being ADA signs.
To clean ADA signs, wipe with a mild detergent and soft cloth. An old toothbrush can be used to gently clean the raised and indented areas.
Signs made from M.D.O. and White Wood substrates need to be waterproofed prior to cleaning with water, as these signs are susceptible to water damage.