There are several ways to help you from having your washer fluid freeze up.
1. Add rubbing alcohol typically the highest strength works best. Add it to your winter washer fluid, there is no perfect formula if your fluid happens to freeze add some more.
2. Vinegar can help the fluid from freezing. What I’ve seen has been 2-parts washer fluid to 1-part Vinegar.
3. Dump deicer spray in the washer fluid tank. Like 1/2 a bottle to the full fluid tank.
When you live in the frigid north it is important to anticipate the winter season and be ready for the cold ahead of time, you could even pre mix some bottles and keep in your car or garage so you are ready for the cold. Also many times your freeze up is not in the tank but in the tips that shoot the fluid or in the lines, in that case you must get the vehicle warm to unthaw. Another handy tip is taking a small item like a paperclip to make sure obstructions are cleared from the end of the spray tip.
(Disclaimer: These are suggestions and have only been what has worked in our experience and cannot be held liable if any of these suggestions do not work or cause any damage to your property.)