I struggled with this for a long time and even considered redoing my shower to eliminate the glass because it bothered me so much. I tried so many different things, including a lot of the stuff listed here but the best solution I found is barkeepers friend (https://barkeepersfriend.com/products/soft-cleanser/). It requires zero scrubbing and leaves the glass crystal clear after. I don’t even bother using a squeegee anymore because this is so easy.

vinegar + dawn dish soap . i tried it this week and it worked like a charm.

https://www.skiptomylou.org/homemade-bath-and-shower-cleaner-recipe/

Found this that works really well. Dawn + vinegar has already been mentioned but try it with the rubbing alcohol as well
https://cleaninghow.to/how-to-make-an-eco-friendly-homemade-bathroom-cleaner/

Vinegar, Lemon juice and warm water.

Used dryer sheets work well too. Wet, scrub, rinse. Takes off hard water stains and soap scum as well or better than vinegar in my experience.

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