Citric acid is a natural compound found in citrus fruits, in powder or granules form. It can be a helpful ally in household cleaning, as a descaler, descaler, softener, brightener, and cleaner for all washable surfaces. Ideal for removing lime scale build-up and keeping the washing machine efficient. Do not use on marble, stone, copper, wood, or fabrics. For glass and mirrors, dilute in water and spray on the surfaces to be cleaned.