[bsmith0404]

There are many car washes that can fit a dually. Mainly the ones touchless ones that don't have the tracks on the floor. I see quite a few that actually put up signs. If all else fails, ask. Touchless car washes aren't always great for removing all of the road grime, but they'll get a lot of the salt off until you have a nice day when you can do a better hand wash.