Affresh Washer Cleaner removes and prevents odour-causing residue that can occur in all washers. While bleach only kills odour-causing bacteria leaving behind the detergent residue, Affresh Washer Cleaner uses surfactant chemistry to remove the root problem. Affresh cleaner is a formulated, slow-dissolve, foaming tablet that gets under residue, breaks it up, and washes it away leaving the washer smelling fresh and clean. Simply place one tablet in the wash basket (without clothes) and run a Normal Cycle (hot option) or Clean Washer Cycle. Affresh brand is safe on septic tanks and safe for all washer components. Use once a month to keep your machine fresher and cleaner. The package includes three tablets.