Nothing cleans or foams better than Viper Brite. This highly aggressive non-acid, alkaline coil brightener is recommended for use on heavily soiled coils that have not been cleaned in years. A 10:1 dilution will provide abundant amounts of foaming power that will push debris out of deeply impacted coils. The alkaline effect strips hard oxidation from aluminum fins to restore the coil to a bright metallic shine. Please respect the power of this chemical and always wear full protective gear.