I always wash my vehicles by hand. Hose it off good first, then Griot’s Garage Car Wash applied with micofiber mitt on top surfaces, then different microfiber mitt for bottom, just gliding over surface, never rubbing too hard. Then rinse off with hose. Then electric leaf blower to get most of water off and blow out crevices. Then softly glide a Griot’s Garage drying towel to finish drying. The key is to work top to bottom, always using clean mitts/towels and never applying too much pressure. Keep in mind one tiny piece of sand can be transferred as scratches throughout the entire car if you’re not careful and rub too hard.