On 'local' diving trips (1100km to the coast), If there's running water around, I'd spray my rig down and my drysuit.
I just bought a yard sprayer (ie, chemical sprayer) for this task for future use (spray fresh water) on my gear.
Generally I keep everything wet (that should be wet) and use rubber maid tubs in the trunk of my car. Once I get home, it gets put into the tub/shower and rinsed down thoroughly, and several soaks. Hang to dry and then put it away (or go diving again ..). Dry stuff gets laundered.
I really should start lake diving on the trip home through the mountains, that way I just need to spray down the gear, and not soak it ......
Travelling, on a 3-4 tank/day trip, I just rinse it off if I did a shore dive (sand), otherwise, its wet until my last dive, then it gets some good soaking/rinse/dry before packing.
BRad