Safe on all washable surfaces, sanitizes surfaces quickly and is convenient to use, with no dilution errors or dilution system training required. Won't harm or stain glass, fiberglass, plastic, porcelain, ceramic tile or finished wood surfaces. It is recommended for sanitizing hard, non-porous surfaces such as tabletops, counters, display cases and walls. Safe to use on glass, metal, plastic, porcelain and any other surfaces that are water safe.