Tub Clean is a fast acting surface cleaner. It is used for the removal of scum line, 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 some hydrophobic ability (repelling water) with the ability to pick up and remove oils on contact. With the ability to create foam, it’s important to minimize contact of the product with hot tub water. This product pH is 2.1, making it an excellent acidic cleaner for oils and organics. Tub Clean is also effective for use around the home, such as vinyl siding, automobile trim, tires, and any other application requiring light cleaning.