Wash it when it’s dirty. If you drive your vehicle every day, we recommend that you wash it at least once a week. Washing weekly ensures that the paint surface is being properly cared for. If you go for too long without washing your vehicle, you may have allowed irreparable damage from bird droppings, bugs, dust micro scratches and acid rain. For many people, a car is the second largest investment they make after their home. It makes a lot of sense to protect your investment now, and especially when it comes time to trade in or sell your vehicle.