Any comments on 1st stages that have those auto close devices?
I have only been diving about 8 years myself, but divers I know, all DMs and 2 instructors, taught me to just rinse all the gear as best I can (hose and a large trash can to dunk if I have available), and rinse everything that made contact with water during the dive. This means dust caps must be off, otherwise you aren’t rinsing part of the threads on your 1st stage that sticks out of the valve, or really all of it since the seal (o ring) is at the very tip (talking about DIN here).
Both my regs are newer and have auto close devices, so maybe I’m just getting lucky because of that protection for stupid guys like me. However, these other guys I know have been diving for 30+ years and rinsing gear this way forever, and never had any issues bad enough to make them change their ways. Just lucky? They dive all over the world, cold and warm water.
When I got certified recently my instructor, great guy, said I should be really worried, take my regs in before my next dive, and never rinse them again without them being under pressure. At home with tanks and compressor I own, I may start doing that, but not sure of logistics when on vacation and trying to sneak my gear in my hotel room to clean in the shower (through the lobby and up the elevator).