There's no better option that a proper handwash at home where you can properly hose out everything underneath. This time of year we don't have that luxury so the coin-op wash wand is the next best thing. Sometimes I'll go really late at night an bring my own bucket, soap, sponge, etc...then just use the wash wand like I would my garden hose at home to do a 'handwash'.
Touchless is OK once and awhile for a quick cleanup, but don't expect the car to come out looking spotless. Some are better than others though.
The DTS was super salty on the weekend, so I took it through a touchless (I believe this is the first time I've EVER taken a car that I actually own through an automated wash of any kind). It did OK at getting rid of the worst of the salt. When I got home (it was around -5, but sunny) I wiped it down with some waterless wash product and a couple microfiber cloths to get the residue off. Came out decent for a winter job on black car.