12 oz Washer Magic, specifically designed to remove the scale and hard water build-up from washer tubs that damages clothes, reducing their useful life. When circulated in the machine during the wash cycle, it increases the solubility of lime scale build-up. Use it every month to help clean lime, rust, and build-up, odor-causing residue, and maintain washer performance. Clean washers are gentler on clothes, which extends clothing life. Use more frequently for strong odors or in hard water areas. Works on both top load and front load washing machines.