[rick3000]

There is no proper way to wash a car, but there are a number of things to avoid:
-Automatic Car Washes with tracks will destroy your rims
-Any car wash that sprays your canvas top with soap because it will strip any waterproofing you added
-Using a clay bar too often

I always go for a hand wash, or DIY. To deal with salt, I go to a coin car wash and use the high pressure water to spray under the car and around the wheels.