Car Wash
A pressure wand at a local car wash is better than nothing. When I use this approach I only use the rinse cycle, never the soap as it much too harsh and will strip all the products with exception os coating like
Optimum Opti-Coat 2.0 or similar.
Many times I'll mix up a 5 gallon pail with soap and hot water then snap on a cover and take it along with gloves and a wax mitt to the car wash. I'll spray off the vehicle with plain water then use the mitt and soapy solution. This does a great job at cleaning the finish....

rops:
I've never had anyone question me in all the years I've been doing this....:dblthumb2: