Windex glass cleaner is safe to use on tinted windows.
However it's recommended to use the Windex Ammonia Free glass cleaner to clean glass that is tinted.
It's also recommended to use Ammonia Free Windex to clean things such as mirrors,chrome, stainless steel, plastic, and vinyl surfaces.
The Windex with ammonia could harm the tinted surface of the tinted window so go buy some Ammonia Free Windex to be safe when cleaning the tinted windows.