Isn't it true that, the water that used at car wash in AZ. contains hi-level of minerals?
Why not do it either later in the afternoon or earllier in the morning before it heats up~?
You could also check into the waterless cleaner sold at W-Mart. I've not used it yet but, let all of us know if you try it and, how well it works..(Here's your chance to be a LEADER~)