I can't figure out an easy way to empty out the fresh water holding tank. My camper is brand new and when I put water in the tank, it has a strong plastic like smell coming out. I don't have blk or grey water hookups and have to empty my tanks into a honey wagon hauling waste water over 50 feet away to a septic. :-( So I am not eager to run much water into the tanks. Is there an empty valve somewhere for the fresh water holding tank? I have a 2022 Heartland Mallard tailwind T180BH. Thanks for any suggestions!