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        Q: Glass Cleaner as Windshield Washer Fluid?
A: yes , but recalling that the lens cleaner liquids may freeze in cold condition . BTW then why are you wish to do that , was no lens cleaner fluid more expensive than windshield washer ? 

Q: Windshield washer fluid as Lens cleaner?
A: You can put glass cleaner ( i.e Windex ) in the tank is , however dilluting it is presumably another idea . It can foam and cause the system to clog up , however , if you dillute it , you ought to be fine : )