We are just starting to get freezing temps in this area. My backpack sprayers are stored in an area which is subject to freezing, and every year I take a lot of time making sure there is no liquid left in the bottom of tanks, hoses, nozzles, etc. This year after rinsing everything out I put about 2 qts of windshield washer fluid ($.99/gal.) in each sprayer and sprayed some out to make sure I got the mixture in the hoses, etc. This seems to be a very easy way to winterize sprayers, and the windshield washer fluid is good down to 35 below. In the spring I'll just flush them out . Thought it might be a good tip to pass on.