DIRECTIONS: Much like clothes in a washing machine, rinsing & agitation does most of the work, EXTREME CLEANER simply softens & helps dissolve sludge & crud in holding tanks. Use on-board or flexible down-the-toilet rinser for best results. Note: Waste tank sensors are historically temperamental, heavy cleaning will usually (not always) help restore scum crusted sensors. Stationary units require more rinsing with less success. Will not dissolve wipes or fix broken or corroded probes. Not a tank treatment or deodorant, to keep odor free use Happy Campers Organic Holding Tank Treatment.