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Magnacharger has 3yr/36k warranty.
Ammonia based products are not good on any anything but windows and I wouldn't even use it on my car windows. You should be fine though.
QFT!
Do not use ammonia-based cleaners on tinted windows. It'll turn the tint purple over time.
maggy has a warranty on what? Tahoe, Yukon or Esky? It doesnt void the manufacturers warranty?