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The results are very good. Isopropanol improves the wetting properties of the washer fluid. Final concentration is 10% in DI water. The original cheapo formulation is actually 9 cups water to 1 cup isopropanol plus 1 TBS of dishwashing liquid. I didn't use the dishwashing liquid for fear of it drying up along the lines. This works out to be roughly 2.5L if you take into consideration 1 cup = 250mL. I think the rationale is this. Isopropanol is a more "organic" alcohol compared with ethanol so grease and grime tends to dissolve in it. Moreover, ethanol is more expensive than isopropanol. Isopropanol is also not as volatile as ethanol so once diluted with water, it tends to stay in the solution rather than evaporate away. It is easy for me to get this because I work in a lab but you can get isopropanol from the pharmacy. It comes as rubbing alcohol. DI water is deionized water. Actually I used RO water which was easily available to me. Isopropanol is also known as isopropyl alcohol.