It's recommended to put a little antifreeze in the toilet bowl to help keep the seal from drying out. If the black tank vent is working properly, you shouldn't get any odors in the bathroom.
I leave the bathroom vent cracked open all winter and it's stored outside. It has a Max Air vent cover on it.
Dave
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Nights camped in 2013 - 55, 2014 - 105, 2015 - 63
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