Beachcomber Tub Clean is a fast acting surface cleaner. It is used for the removal of scum line, dirt, scale, stains, grease or oil build-up on hot tub surfaces. Its environmentally friendly nature comes from a citrus based formula that is fully biodegradable. Tub Clean has hydrophobic virtue and can remove oils on contact. It also has the ability to create foam so it’s important to minimize contact of the product with your hot tub water. This product pH is 2.1, making it an excellent acidic cleaner for oils and organics.