Whirlpool affresh Washing Machine Cleaner deep cleans to help remove the odor-causing residues and grime that daily loads leave behind. The time-release tablets are EPA Safer Choice certified, septic-safe and designed to clean inside all brands of machines, including HE (High Efficiency) washing machines. Simply place 1-tablet in the wash basket (without clothes) and run a Normal Cycle (hot option) or Clean Washer Cycle. Time-release tablets penetrate, dissolve and reduce or remove odor-causing residue Leaves washer smelling fresh and clean Environmentally friendly, safe on septic tanks and safe on all washer components Recommended as a monthly treatment