will you nice rv folks explain the process of winterizing. well i used rv antifreeze and when i got it to come thru the lines and out the facuets,ie sinks. i knew it was done right even the water heater was by passed. my concern is when i start using my sinks and all water plumbing as i normally do it seems like the 2gal. of af will be gone. but that was all it was to winterizing. how does it stay winterized. please help. mary ellen sax.