Muratic acid for tile. But don't get any on your paint.
The following was posted by Upodium Car Care on December 4, 2010:
Non professional detailers may try a 50/50 blend of vinegar and water with some fine steel wool (00 or 000) for windows.
The following information is more hazardous. Contact your local professional automotive detailer for assistance.
If the spots are very bad, a light blend of sulfuric and hydrofluoric acid is the next step with the steel wool on windows and a soft rag on paint. Cooling the surfaces with water is very important and never let the acid dry on any surface during the application process. In extreme situations where the water spots have baked into the paint for an extended period of time, wet sanding may be required. This will remove spotting but will also dull the surface. Buffing the car with a compound will restore the shine. Always re-apply a coat of wax after these steps.
No....
Maryspray your window with some white vinegar and water and the spots will disappear.
Believe it or not, peanut butter will work. It has oil in the panut butter which should cover the spots.
Minnesota - it actually means "sky tinted water," and refers to the many lakes and rivers of the area.
minnesota
The Dakota words mini and sota mean "water" and "cloudy" or "sky-tinted", so the answer is Minnesota.
You can start of by spraying your window with water to remove the dust and the hard material. After that you should take a bucket of warm water and a sponge. Pour special car soap in the bucket of warm water and gently clean your window. Afterwards spray your window again with cold water to remove the soap. And the last step is to dry you window with a special water absorbing cloth, which you can buy in any specialized car material shop.
Hawaii
First, spray some soap water on the window. Now, gently but carefully, scratch down the sticker.
white vinegar (acetic acid)
Most commercial cleaners will not effectively remove water spots. If the item really is glass, use white vinegar to wipe the spots off. This should dissolve the water spots quite effectively. Simply apply with a soft cloth straight from the bottle. Rinse with plain water.
3M window tint has a sticky side that attaches to the window. Clean the window with soapy water and leave wet, arrange the tint on the window and then smooth down to remove wrinkles.