OK.. You must remember one of my sons is an environmental engineer.. I wrap all toilets and drains with saran wrap and seal them with tape when I leave. This is sinks, showers, tubs and toilets.. This keeps water in the drain and keeps them from drying out. No smell when I return and it zips off easily.. A pain the last day, but worth it. Too many people have talked of drain problems. I leave the air on since I live in mildew country and turn the air up to 85, unplug everything in sight. turn off the hot water heater, turn off the water for the washer..and of course cancel, mail,tv,newspaper, etc. Remember I am going for five months, not a few weeks. I have a couple who caretake for me in Franklin, They close up and open up my house. Since that is frost country, they use coolant in the toilets, etc. Leave the electric on there since I want to leave the fridge on.Anything I am not sure about goes in the fridge.. sugar,flour, etc . keeps it from harm. They also pressure wash my house and this year will paint the trim for me. I love them dearly. I am told that drains that lose their water seal are bad news by my sons.