wind shield washer in toilet

Effy wrote:
As others have stated, please do not use windshield washer fluid. For just a little more use the product that's designed for this - RV antifreeze. it's non poisonous, and eco and septic friendly.

But isn't RV antifreeze designed for the fresh water tank?? The whole idea it that you can put it into your fresh water tank and still be able to use the fresh water tank once it is drained out and not poison yourself. When winterizing, we just drain our black and gray water tanks. There is no reason to be putting RV antifreeze in them. And no reason you cannot put windshield washer fluid in the toilet or drains. You probably put much worse products down your drains!!!