DTLA in the Arts District for me...
My detailing supply collection is pretty disgusting...considering I've used it all once in the past 12-18 months.
I have this Optimum No-Rinse Hose-less wash solution which works pretty well:
http://www.autogeek.net/optimum-no-rinse.html
The self-service ones are hit-or-miss...I usually take two buckets and just see if I get yelled at. So far, I haven't been kicked out or banned from any self-wash-bays
