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Summary: Wiper fluid is important for winter driving because it will not freeze to the windshield. Get a car ready for winter by adding wiper fluid as demonstrated in this free car maintenance video from a professional auto mechanic.
Greg Burchell is a retired auto mechanic. He was an auto mechanic for more than 40 yearsread more
"Now we are going to talk about window washer fluid. Again you could pick this up in your auto parts stores, your super market, your Wal-Mart, Targets, K-Mart, Sears, everybody stocks this. This is good for about 20 below. You'll need it in your winter months. If you use straight water it will freeze up on your windshield, you won't see where you are going and this will help to keep your windshield clean and hopefully you'll have safe driving. It is very easy to put in. We'll show you in a second how to put it in. We are going to locate where our washer fluid would go. It is plainly marked. There is a little windshield with a little water spout and this is where we are going to top it off. I always like to use a funnel, there is a seal in there and we remove the seal and you know you've got good stuff when that seal is on there. Use it straight out of the bottle. We are good to go. You always want to use a windshield washer antifreeze that is good for minus 20 degrees Fahrenheit. As you ride down the road if you are using just water it can freeze up on your windshield, causing bad visibility and you know what can happen from there, an accident."
eHow Article: Winterizing a Car: Adding Wiper Fluid