When you're washing your car in your driveway, you're not just washing your car in your driveway. There's no problem with washing your car. It's just how and where you do it. Most soap contains phosphates and other chemicals that harm fish and pollute the lake where families swim and play.
If you live in the city and you wash your car in the driveway, the soap, together with the dirt and oil washed from your car, flows into nearby storm drains that run directly into the lake. The phosphates from the soap can cause excess algae to grow. Algae look bad, smell bad, and harm water quality. As algae decay, the process uses up oxygen in the water that fish need.
Car washing doesn't have to be a problem. What will you do to help?
Use a commercial car wash, either self-serve or machine wash.
Wash on lawns or other surfaces where water can seep into the ground.