Under Body Flush

An easy way to was the underside of the vehicle. I put a cheap on/off valve on the end of my hose.....and a short length of hose on that.
Then, at the end of the short hose, I put a small metal lawn sprinkler.
I slide the sprinkler under the car, and turn on the water, using the on/off valve. I can slide the sprinkler around under the car and wash the salt from the underside. I use the regular spray nozzel to wash out the wheel wells.