Environmental protection: biodegradable formula, without phosphate or perfume, without whitening ingredient. Convenient to Carry: Diameter is only about 0.6 inch, saving more space than traditional cleaning fluids. Protective Glass: The car wash effervescent tablet is not only suitable for cleaning car glass, but also can reduce friction, protect the glass surface, and extend the service life of the wiper. Agrees for cleaning mirrors, windows and tiles. Easy to use: Place a clean effervescent tablet on the wiper, then add water. Or dissolve the windshield cleaner in a container first, then pour the dissolved cleaner into the wiper reservoir. SAVE MONEY: Our multifunctional effervescent tablets will help you cut costs. 1 piece + 4 liters of water = 4 liters of windshield cleaner, you will get 240 liters of windshield cleaner. It dissolves without no residue.