Boarderguy
Chief Narctopus Wrangler
It wouldn't be a bad idea to do your initial rinse immediately after your dive since you don't have a tank at home. Couple bottles of sink water run over your 1st stage with it on the bottle and turned on is good. The goal is to avoid getting any water into the hoses and 1st stage. Air pressure ensures that everything stays dry. Short of hooking it up you can do a quick rinse as stated and maintain the 2nds below your 1st stage. Depending on how often you're diving it wouldn't be a bad idea to pick up a cheap aluminum tank to keep at home just for this purpose. You'd only need to fill it maybe once a year and your regs would be happy.