Originally Posted by quickboat

Without soap and water the chance of micro scratches are high. Dust is abrasive and dry washing will almost always leave these clear coat spider webs. Using a duster on a garaged car is fairly safe but after you hit the road the dust can "lock in". Black shows spider webs the most but you white and silver guys have them but they are hidden. Two bucket washing, doing the wheels first are just a start to keep scratches and water spots at a minimum. Washing in the bright sun is a bad idea. Try to wait till dusk or dawn.
JMTC