What's the use? Canadian Tire has their own Motomaster branded windshield washer fluid with Teflon. I can't see it being any benefit really.
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Wow, that should make the windshield slick as eel snot on a brass door knob.
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More expensive, but better IMO, is the Rain-X washer fluid. Eventually, the water WILL bead off your glass. It's just not as fast as applying the Rain-X repellant directly.