Can I use any windshield washer fluid I want for my car, or do I have to match it to whatever remains in the resevoir?
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Use what you want.
What you want to use is RainX. Or at least use RainX’s additive to what ever washer fluid you do use.
If you live in a cold climate, just make sure the fluid you use won’t freeze.
I believe so, but better yet (if your car will not be subjected to freezing temperatures) is to just use water. WW fluid contains VOC’s which contribute significantly to pollution.
California Environmental Protection Agency Facts About Windshield Washer Fluid for Your Automobile
https://ww2.arb.ca.gov/sites/default/files/2020-04/Remediated_windshield_washer_fluid.pdf
