The only way to remove hard on calcium is to machine buff them using a cutting compound and plenty of water. The only problem is a chance of swirl/scratch marks but will always look better than the thick calcium build up! Metal shine/acid will also get rid of it but will leave streak marks on the glass and paint (if removing from a car).
You can clean calcium buildup on windows by mixing equal parts water and white vinegar in a spray bottle. Spray the solution on the affected areas, let it sit for a few minutes, and then scrub with a sponge or cloth. Rinse with plain water and dry with a clean towel to leave your windows sparkling clean.
Acid Water
To effectively clean mold off windows, mix equal parts of white vinegar and water in a spray bottle. Spray the solution onto the moldy areas and let it sit for about 15 minutes. Then, scrub the mold with a brush or sponge and rinse the windows with clean water. Dry the windows thoroughly to prevent mold from returning.
White vinegar will dissolve most water spots and leave glass extremely shiny. Very stubborn marks may be calcium deposits or etches on the surface of the glass. CLR will remove the calcium, and if the scratches are not too severe, rubbing with a paste made of baking soda and water will polish them off.
You can clean calcium deposits off with vinegar. First loosen the deposit as much as possible, then heat white vinegar in the microwave and pour into a spray bottle. Spray and let deposits sit until you can wipe them off.
I use one of those straight razor holders and scrape it off.
To clean calcium from a kettle, mix equal parts of water and vinegar and let it sit in the kettle for a few hours. Then, scrub the inside of the kettle with a brush or sponge to remove the buildup. Rinse the kettle thoroughly before using it again.
Scrape off what u can with a razor blade. White vinegar should remove what's left.
Mixture of 50/50 methylated spirits and water
Try CLR, the calcium, lime and rust remover. It's in most supermarkets with the cleaning supplies.
Both are good, it depends on what type of tile your trying to clean. Tile Savers of Houston.
No, not necessarily. It depends on what you are trying to clean off and what the surface is! Obviously you don't clean windows the same way you clean the sheets on your bed! Different tasks require different measures.