Makes a summer windshield washer fluid mix for about 16 cents a gallon. just a teaspoon (or two for the really gross baked-on junk) of Clara Crystal to a gallon of reverse osmosis water. Buying a case, a bottle of Clara Crystal is only $7.95 (with taxes in my state), 1 teaspoon is a modest 0.16 cents per dollar. It's easy to save $1.50 or more compared to buying a pre-packaged bug wash from the store. Wintertime is coming, so this and a gallon of reverse osmosis water will freeze slightly and turn into a block of ice. No problem, start by adding 20 percent alcohol to the mixture, such as need a lower freezing point). If a 20 percent ISO mix freezes, add more ISO to the mix until it stays liquid in even the coldest temperatures. Keep in mind that most alcohols like ISO evaporate slightly above freezing (altitude also affects the vaporization/boiling point) so you may need to replace any ISO that evaporates on a warm day in the winter months. You can usually find a 2 liter pack of ISO 91 at Sams for a bargain price, so make a winter washer fluid mix. may be under 1.50 gallons depending on local winter temperatures. Here winter mixes typically cost between 2.99 (retail) and 3.99 gallons.
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