By Mary
Slice a cucumber into thin slices and rub them over the glass. It is not instant, and needs to be rinsed afterward, but it does dissolve the hard water residue. Works fine too on chrome faucets that have a slight leak and grow a stone.
Have FUN!
DearWebby
http://webby.com/humor
When direct sunlight hits a water on a window, it doesn't just dry it, it bakes the residue into the window, penetrating the glass. But it doesn't end there. Every time the sun hits the window, the residue continues to bond with the glass until it is nearly impossible to remove. During the early 1990s, I tried everything from various grades of bleach to steel wool, toothpaste, kerosine, gasoline, paint thinner, you name it, I tried it. Someone even suggested burning it off and all that did was to highlight the stain. I should also add that when I was able to scrub out the stain, there was a film that formed on the glass that could be seen at a side angle.
Then I tried a solution I bought online, gamma-butyrolactone (GBL) used to remove nail polish. All I did was to wipe it on and wipe it off. The stains were gone! No effort whatsoever! A professional window cleaner had been working next door and when he saw my windows, he really believed I had replaced the glass. He could not believe there was any product that could be so effective until I demonstrated how fast and easy it worked.
Today, GBL is only available by mail order from outside the U.S. It is used to clean chrome wheels and it really does get the toughest stains out of metal surfaces.
How do I get water spots off the outside of a picture window?
By Debbie
Are they water spots caused by hard water, such as that from a sprinkler, hitting your window? If so, vinegar should remove them. Do not dilute when you use it. I would put it in sprayer, and spray on full strength.
I have four 10'X6' windows (all glass) and about 15 smaller windows of different sizes that get sprayed by water containing calcium, and various other minerals that will not wash off with soap or other washer solutions. I presently use dish soap and hot water and a bit of CLR added. I have used an ammonia solution, vinegar, and rubbing alcohol. Nothing really phases the stains even though the windows get clean, they still show those hard water stains.
We use ditch water to irrigate the lawn by a sprinkler system. Help! I also used automotive products and the products that you are supposed to put on and hose off. They definitely made no difference other than to clean.
By Lula C. from Cimarron, CO
I am not sure using CLR would be good for the environment, but as long as you keep it off the ground and wear gloves so you are protected... I can also suggest a razor blade to remove any remaining film/crust from hard water stains. Also found this: http://www.ehow.com/how_5412240_remove-hard-water-stains-windows.html
http://www.ehow.com/how_7013639_do-water-stains-glass-windows_.html

How do I remove hard water spots from glass?
By Barbara G.
Someone once told me that oven cleaner would do it. I have never tried it.
All my windows have spots on them and that makes it difficult to see. I have deep, deep water. I have tried many cleaners. Please help.
By Dennis
If you have hard water spots on your windows they will be hard to clean. Lime away does work but I don't like the harsh chemical. Spray your window with a window cleaner and use a scraper with a blade (the kind you use to remove paint on a window) to scrape over the hard water spots. Be careful to keep the blade flat and not scratch the window. Wipe the window and spray any spots you missed and scrape these away. If you have a huge build up, ammonia water works better than window cleaner but then again, you are dealing with harsh smelly chemical.
How do you remove hard water spots from windows?
Manette from Park City, UT
How do I get hard water stains off a window? The sprinklers hit it and there is a mark.
How do you get hard water spots off of outside windows? I have tried vinegar, Kaboom, plain water, and all kinds of window cleaners.
I am looking for an easy way to clean hard water rain drops (stains) off of windows.