Unelko 57551 Invisible Shield Dual Action Glass and Surface Cleaner, for Windows, Showers, Tiles, Resists Soil and Grime, 32 oz, Beige

There are specific glass cleaners for this which unfortunately are not available at your local store. I use something called Invisible Shield Glass & Surface Cleaner + Repellant. Don't confuse it with Invisible Glass which doesn't do shit. https://www.amazon.com/Unelko-57551-Invisible-Surface-Cleaner/dp/B0CSZ41PG3/ref=sr_1_4_sspa I think the way they work is they leave behind a polymer film which prevents these deposits from forming. Problem is, the film doesn't last very long, like a week or two, then it needs to be reapplied. It does work though and it's very satisfying to watch the water come off in sheets when you're showering.