I''ve taken plenty of shots from my father on this already, but feel free to give me another. The first time I winterized the boat I accidentally used a solution with Ethylene glycol based antifreeze. I''m concerned about the contamination of my freshwater tank, which is constructed of that opaque white plastic. Apart from not using the tank (which is what I did last year) does anyone have a recommendation on how to clean the tank? Thanks.