Hi guys, I just put the red stuf into the systems, but at the end of the year, after not using the head after the last flush, there was still a bit ( 1-2 cups) of the liquid blue in the bowl (holding tank....) after haulout, I aded about a half gal of ethyl alcohol for winterizing, is this ok ? I really have no way of sucking the thing out now, just wondering if it would affect hoses, or reduce efffectiveness of alcohol etc... Thanks for any help.