I can say from experience NOT to use Peak brand washer fluid. I dumped a gallon of it into my SD's reservoir and the first time I used it my windshield smeared badly. Not sure if it was "cleaning" my aging (but not cracked or torn) wiper blades but it left a whitish film all over the windshield! Also it left blue marks as it streaked along my roofline. (They came out with washing the car.) I see Prestone makes a yellowish "premium" washer fluid that is about $2 a gallon but I haven't tried it. I also have used a pinkish "premium" fluid (50/50 brand perhaps?) but I haven't seen this for sale anywhere recently. That stuff worked well. My mechanic uses a product from Wurth that works nicely, and it smells nice too Just my $0.02...