Use a commercial car wash that treats or recycles its wastewater, or wash your car on your yard so the water infiltrates into the ground.
Check your car, boat, motorcycle, and other machinery and equipment for leaks and spills. Repair leaks as soon as possible and dispose of used auto fluids and batteries at designated drop-off or recycling locations.
Clean up spilled fluids with an absorbent material like cat litter or sand. DO NOT rinse the spills into a nearby storm drain. Remember to properly dispose of the absorbent material.