I was in the same situation with my shower doors until i found this product at a home show Bring It On Cleaner, and let me tell you my shower doors and tile look like NEW! Thanks for a great product!
I can sooooo relate to your problem! I don't have a solution, but I can tell you what DOESN'T work!! CLR, Limeaway, ammonia, vinegar, oven cleaner, muratic acid (for pools) brillo pad, magic eraser. Oh geez what else have I tried?? coke, soap and water, TSP, paint thinner... I'm looking forward to whoever can post a great remedy for this! we have very hard water here in the desert.
Try distilled vinegar dampened paper towels, lay them flat on the glass add more vinegar this way the vinegar can dissolve the build up, if the vinegar doesn't work try use a limeaway like the vinegar This works on shower doors also c.l.r. does not work for me. Are you sure it's a chemical build up and that it hasn't actually etched the glass?
I would first try a Magic Eraser. If that doesnt work I would then try brillo. I had gotten some really tough spots off my tub faucets using some Soft Scrub with bleach and a green scouring pad.
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