I use a pressure washer, Karcher, with the lower power nozzle and make sure to keep a decent distance. If I had an area of poor paint I wouldn't use it on that area. The higher power nozzle is a definite no-no. I rarely use it on anything.
I use hand held air blower to blow air out of nooks and crannies too. A prize in a Mogmag competition designed for cars. Amazing how much water does get trapped under the wing beading even after towel drying. Relubricating these areas is then needed though.
