In my neck of the woods we have summer and winter blend windshield washer fluid because of the extreme temperatures that they encounter. Right on the label on the Wal Mart brand windshield washer fluid it will tell us whether it is winter or summer blend. It used to be color coded where the summer was blue and the winter was an off shade or red but that is no longer the case. You have to check the labels. There are chemicals in the winter blend that I was told you do not want in your rifle barrels... I forget the reason why. But since the summer blend works so well, why worry.

You could always use cheap glass cleaner if you like and mix that with the alcohol.