I use Rain-x on all windows and mirrors. and the little bottle will last me more then a year. I have tried waxing and that doesn't last as long for me. Also if you live in an area that gets frost or freezing rain, rain-x makes it easier to scrape your windows.
Rain-X poll
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Aquapel's the way to go definetely..10 bucks a stick, managed to squeeze enough out for the windshield, back window and juuust a bit on my side windows which aren't really necessary to treat anyway. My last car lasted nearly 10 months on the windshield and even then it still worked but less. My 3's had it on for 3 months so I'm expecting similiar results 
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