I can tell you this.....and I just learned this last week. Wiper fluid comes in different degrees. Our normal stuff goes down to like 22. Then there is some we carry less of that goes down to 0. Then the stuff we don't stock goes down to -32.
Around here MOST washer fluid is labeled 'Winter' or 'Summer'. Never had any freeze solid, but have had slush in the bottle if I still had a lot of the higher temp stuff in when it gets too cold.
