While we don't get the amount of salt and grime that you do (Thank God for that!), I find that most touchless - Laserwash, etc. - car wash places do a reasonably good job on 'normal' dirt that accumulates during a week of commuting duty. Of course, if you went off-roading or are at the end of a huge snowstorm, a "hand job" :biggrin2: might be necessary for your vehicle.
There is a place close to me that has a 'basic' wash for six bucks and it is touchless. Right down the street, there is a place with soft felt brushes and they charge $7 (but give you a free vacuum and a 'jet-air dry' for your exterior). For the extra dollar, I find that it is well worth it - especially for the wheels.
A full-service joint that cleans your interior windows and wipes down your dashboard is nearby, but it is hard to get out of there for less than $20 (including tip). I only go there if my car is extremely dirty (which very seldom happens), the weather is far below freezing or if someone gives me a gift certificate for the place.
I would not worry about scratches anymore, as even the most rugged automatic car wash is light years ahead of those that were 'state of the art' just a decade ago. You'll get more damage from road debris and door dings than you will from a typical car wash.
As for the self-serve car washes, the high-pressure nozzle is good for blasting road salt away from the wheels and undercarriage.......but beware the hand brush that may have been used by some dolt to degrease his engine.
:bash: