Alkaline degreasing is mostly used by sodium hydroxide or sodium carbonate in conjunction with surfactants (surfactants) at concentrations up to 10% of active substances and temperature of 40-70 ° C for 1-20 minutes (depending on the degree of contamination of the substrate). Grease in emulsions emulsifies - saponifies, and tends to settle again on the surface of storage tanks from which it needs to be removed. Hard water, which is most often treated with phosphates, reduces the degreasing efficiency. It is important to ensure effective liquid flow when degreasing, and to avoid foam formation during spraying. Alkaline degreasing is followed by rinsing with demineralized water.