We have hard water and the shower glass gets all marked. I read a blog post about using cleaner for a glass top stove, which I have. With a blue scrubbing sponge, give it a good scrub and then wipe it off with a paper towel. I then clean with windex.
I use this https://weiman.com/glass-cooktop-cleaner-polish
Our shower is only a few years old so it cleans up well. The shower in the hall bathroom is 20+ years and the doors are etched. It doesn’t come up quite as well, still a bit hazy, but way better than before and without too much effort.
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