Never Dump Down the Drain
Engine cleaner can contaminate waterways if it’s disposed of improperly. So never dump it in the trash or down the drain, even it’s unused; dispose of it as Household Hazardous Waste.
Clean at the Car Wash
Self-serve car washes have floor drains that are better equipped to handle contaminated water. Bring your vehicle to a car wash if you’d like to clean the engine.