Just out of curiosity, you dont have indoor type car washes? In Germany, we have pressure washing stations that have roller doors and such. There is a good one that has a lift on it also. Its not 75 degrees or anything, but it does keep the cold out and you can get the salt out from under the car. Figured a lot of northern states would have something similar.
EDIT: Brushless is good when you have a nice coat of wax and rain-x on the windows. But for your issues, I wouldnt waste the money...
"With great power comes great responsibility." -El-Superbeasto