Can you wash your car too much?
Scotty, there are those online saying that you shouldn’t wash your car at a retail location during the winter because the water is likely contaminated with salt, mag-chloride, etc. from previous drivers and if the wash doesn’t properly filter the water you putting activated salt in water solution onto your car which can accelerate rust. Is this correct or just something interesting to talk about online? I have also read online what sounds like paranoia. People are saying you can wash your car too much and cause rust/corrosion to the parts underneath your car. Is this accurate, can you wash your car too much?
Reverse osmosis is an excellent, albeit expensive, way to purify water.
As long as you aren't washing your car with salt water, you'll be fine. I have an unlimited car wash package for my vehicles and my daily drivers get washed nearly every day, sometimes twice a day. Never have had an issue. I do use an upscale wash, not a gas station special though.