wind shield washer in toilet

I use the "pink stuff" to winterize and then use it for liquid for toilet while still in below freezing temps. Remember it is the night time that can get very cold. I use the rv antifreeze because it also lubricates the valve. Windshield washer is by its nature harsh so it is ok in an emergency when you are out of pink stuff but not as your primary. I probably use more of the antifreeze than necessary but figure for a couple of bucks it is better to error on the high side.