OxiClean Washing Machine Cleaner with Odor Blasters helps remove odor-causing residues in any washer. Cleanser is septic-safe, phosphate-free and safe for use in both High-Efficiency (HE) and standard washing machines. To use, simply remove all clothing, pour one pouch into the washing drum (no laundry detergent), initiate a 'Clean Washer' cycle (or a normal cycle with hot water) and wipe remaining residue with a towel. Use one pouch a week for three weeks, then continue using one pouch per month for maintenance.