I'm still not sure. Only on my first gallon. Appears to clean the windshield and leaves no hard water stains. I premix in a gallon container and don't rely on mixing it in the container. My first experience with a similar product was a 303 from the USA. This worked great, but the availability and price prompted me to try an alternative. I love the idea of not having to buy a gallon of windshield from the store every time it runs out. I will update after the next few games. I agree with other reviews that the packaging is not great. Seems like a lot of waste, but it's probably great if you want to keep one in your car as a backup. I haven't counted them yet. Sorry I missed my return window by 2 days. I really don't think they work. My son noticed that they smell like vinegar and leave white stains on the windows.
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