Have a winterizing question regards to fresh water (drinking) system. 
I bought the non-poisonous (pink) antifreeze that is for RV's and
marine water systems.  My instructor for "seamanship" course which I'm
currently taking said NOT to put that stuff (or ANY antifreeze) in the
water system.  He said it's been known to clock up the lines.  I
called my boat dealer and the head mechanic told me that's a bunch of
bull, and that YES, I should put the antifreeze in there after first
draining as much water as I can.
Anyone have any first-hand knowledge about this?
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