Can you use windshield washer fluid designed for winter during summer - General Discussion - Car Talk Community

I have a few gallons of washer fluid that are labeled as designed for winter or freezing condition. Some of them are labeled as “de-icer” windshield washer fluid. 1) Is it safe to use these winter formula windshield washer fluid during now in summer or non-winter seasons? 2) During summer, is it to safe to mix just a tad of tap water with these winter forumula windshield washer fluid in case the fluid is too strong for non-winter season? Thank you for your advices.

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