The hard water deposits disappeared before my eyes with hardly any effort. The next morning I took a wet Brillo pad (the steel wool pad with soap) and gently washed off, in a circular motion, the hard water stains. I took the 30% vinegar and sprayed the doors and let it sit overnight. I was in the process of buying new doors and thought I would try something radical.I had nothing to lose. They recommended letting it sit on the door for 5 minutes and wiping it off. One of the many sites I visited recommended I buy some industrial grade vinegar (30%). Spend over $100 trying various methods and products to remove the hard water deposits. I had shower doors with five years of hard water deposits. BONUS! It works wonders on windshields after a winter of salt and sanded roads too! It also works on fixtures, stone and ceramic surfaces.
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The detergent helps the vinegar-foam cling better to the glass surface. Next, I spray a liberal coating of the hot solution (top to bottom) & let it sit for 5-10 minutes, before rinsing it off with scalding water. Then, I hose down the glass with scalding hot water. I leave the lathered glass block sit while I heat the cup full. Before using the heated Vinegar/Dawn solution, I first spray the room temperature solution onto the glass block walls of the shower, and scrub gently with a green scotchbrite sponge.
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When needed I heat 1 cup in the microwave to 150-160 degrees (F) and transfer it into a 1 quart spray bottle, that has been insulated by wrapping it with a hand towel, secured with two large rubber bands. I've found that making a solution of 80% White Vinegar and 20% Dawn detergent works well.