TropiClean Flea + Tick Laundry AdditiveLaundry Additive kills fleas and ticks on blankets, towels, pet beds, rugs, and soft toys by contact. This natural* essential oil blend contains nature's most powerful pest fighting ingredients, maximized with lemongrass oil, cedarwood oil, clove oil and sesame oil, for long lasting effects. Cocoa butter provides soothing relief to irritated skin. Safe, when used as directed, for routine by simply add to washing machine with your favorite detergent.