I live on the north shore of Lake Superior, so everyone here knows we will need lots of this windshield washer anti-freeze every winter - and that includes both users and stores that sell it. So we live prepared. I buy only the stuff pre-mixed for -40C (that's also -40F), or maybe -45C. Why? First, it almost never actually gets that cold here. Secondly, it appears to me that the small volume of antifreeze sitting in the very tips of the jets by the windshield evaporate some of their alcohol to get LESS alcohol content than when made, so poorer anti-freeze and it CAN freeze at a higher temp than specified. So -40C gives me insurance that it won't freeze around -30 to -35C. Usually the best deals are jugs of 4 l (about 4 Gal), and I have three cars in the family to maintain. So I stock up on 2 or three of those in the fall, keeping an eye out for sales, and replenish a bit as needed by mid-winter. This past fall the best deal happened to be on 1 Gal jugs, so I bought a couple cases of 4 of those.
Once spring is established and no freezing ahead, I pump the remaining antifreeze out of each car into an empty jug and store until next fall. Then fill with summer bug-wash solution. Reverse process in the fall.
On the rare occasion that the washer system freezes up, because I have it filled with strong anti-freeze, it is almost guaranteed that the ice plug is only in the little squirt tips. So I usually just clear away the nearby snow, then blow on them hard a few times to warm them and very quickly activate the squirt system to pump fresh antifreeze through. If that's not good enough, a hair dryer pistol can really heat them up and melt any ice in the jets, and that usually is enough.
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