Leslie's Clean and Prep is used to clean and degrease; while simultaneously dissolving mineral deposits and increasing porosity for good adhesion on surfaces for painting. It can be used on: painted surfaces, bare plaster, concrete or fiberglass. Leslie's Clean and Prep is VOC compliant, odor and fume free, water-rinse neutralize and is biodegradable. It is safe to use near plants or grass and is excellent for filter element cleaning.