Acrylic Brightener is the perfect and easy way to clean the surface of your acrylic hot tub shell! It eliminates mold and mildew odors without bleaching the surface, and prevents scum lines from forming near the water's edge. Wipe it on to give your entire hot tub shell a thorough cleaning whenever the water is drained. Or, spray it on the shell above the water line when the hot tub is filled. It's specifically designed to withstand the higher temperatures found in hot tub water. And, because it is a natural product, it won't interfere with the chemistry in your hot tub's water. Note - do not use car wax to polish your hot tub because wax will simply melt in the high water temperature!