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50/50 white vinegar and distilled water FINALLY got the inside of my windows clean. Windshield was the worse. Needed multiple cleanings. Invisible Glass now for maintenance. Invisible Glass is also tint safe.
My uncle taught me, many years ago, that Windex and newspapers works great. While your first few cleaning wipes are done with moist newspapers, new, dry newspapers are paramount for removing the remaining moisture and streaks.
You can probably use cloths or paper towels, but the important part is that the last wipes need to be done with a dry cloth. Even a slightly moist dry cloth will leave streaks.
Yes, you do use a lot of paper, but that's why old newspapers are great!
OMG thank you all so much for the window cleaning tips! I was helping my husband clean all his M3 glass over the weekend and we are SO frustrated with all the friggin' streaks! Can't wait to try the above tips/techniques.
Reidell makes awesome lint-free "towels" to clean your windshield. Every microfiber towel I've used leaves lint on the windshield, mostly detectable at sunset.