unexpected success using chlorine bleach spray cleaner getting cloudiness out of glass when nothing else would do it, not even scrubbing. Soaking is how I've done it. Spray a good amount of the cleaner around the inside of the glass, let it sit, then fill the glass with water and let that sit. I've been surprised how well it works. I imagine you could use just plain chlorine bleach rather than the spray cleaner.

Over the years collectors have reported a number of household products that they have found cleaned the lightest, to the heaviest hard water stains. Below are just a few of them.

Fill the object with a mix of ammonia and water. A few hours should do the trick if the stain is not too thick.

Vaseline or petroleum jelly can sometimes remove light calcium build-up. Let it sit for 4-5 days before removing.

Fill with luke warm water and drop in a denture cleaner tablet.

Pearl Drops Toothpaste has been recommended for light calcium stains. Dab a little on your index finger and lightly rub. Wash with water.

Dow Tub and Tile cleaner. Spray on, let sit, then rinse.

There is a product in the supermarkets called Krazy Kloth. It is highly recommended for the toughest hard water stain. Follow the directions on the packaging, and wash with luke warm water.

Lime Away. The same product you use on your tub and shower doors. Always remember for products that require rubbing to do it lightly and in small circles.


http://www.ha.com/tips-for-cleaning-cloudy-glass.s

you may want to get the industrial strength used to strip paint if it is too bad.