For faucets, shower heads and water reducers: Mix 2 to 5 tablespoons of citric acid with water. Rub the areas attacked by lime with this solution and leave to act before rinsing. For smaller items, you can let them soak in this solution for half a day, then rinse.
HAIR AND SKIN:
Citric acid and its diammonium, potassium and sodium salts are all used to help preserve cosmetics and personal care products by chelating (complexing) metals. Citric acid and its salts are also added to cosmetics to help adjust the acid/base balance. Other functions of the citrate ingredients include: Buffering agent , Cosmetic astringent , Cosmetic biocide , Hair fixative , Oral care agent , Plasticizer , Skin-conditioning agent – emollient , Skin-conditioning agent – miscellaneous , Skin-conditioning agent – occlusive , and Solvent .