Windex is a cleaner and glass polisher that leaves a streak-free shine on just about any finish. However, Windex isn't the right choice for cleaning your shower.
The ammonia that gets left behind when you use Windex will eat away at the surrounding elements in your shower, such as the metal finishes or grout in the tiles.
Ammonia-free Windex has fast-evaporating chemicals, but little suggests this formula is effective against hard water stains, which usually require an acidic solution to break down.