Today when you get out of the car grab all the trash, empty cups, garbage, anything you don't need and throw it in the nearest garbage can. It's best to do this when you are out in public because when you are getting out of your car at home you are grabbing your gym bag, shopping bags, dry cleaning, etc. When you get out of your car away from your house you generally don't have much in your hands and there is always a trash bin nearby.
Today, when you are taking the kids into school have them all grab some trash and throw it away on your way into school! Or when you are walking into the grocery store grab all the trash in your car and throw it away on your way into the store. Woo hoo, your car clean of garbage!