Rain-X Windshield Washer Fluid Additive | $4 | Amazon | Clip the $1 coupon
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What if you could apply a coat of Rain-X to your car just by pulling on your windshield wiper stalk? This bottle of washer fluid additive is just $4 today after you clip the $1 coupon, and mixes with your existing washer fluid to encourage water beading. And with a 4.3 star review average from over 450 customers, it seems to actually get the job done.