Does the glass door on your shower look like this?
After a multitude of cleaners and techniques I finally found one that works very well.
Using this
Follow instructions. It ain't perfect but a magnitude better than any other cleaners I've tried, including glass polishing compound.
WARNING
THIS IS NASTY STUFF.
Have a powerful box fan blowing on the job with as much ventilation as possible.
Wear Gloves.
Don't splash on your floor, clothes, or porous surfaces.
Wash off any metal parts when done, it will eat them up.
It does leave a slightly greasy finish, I followed up with Windex.