How can I get rid of water marks on my glass window?

is it possible they glass is scratched? Not dirty? Try alcohol 1cup with 1 cup water. If that doesn't work call a reputable glass company.

Is it possible the seal has broken on the window?Try using white vinegar,water 50/50 adding a dab of blue dawn dish soap and a dab of jet dry

Try using 000 steel wool and glass cleaner or ammonia. Then wipe down the glass with crumpled newspapers or lint-free cloth. You might need to do this a couple of times, but the hard-water spots should give way.

It looks like double paned glass. Is it between the panes? If so, the seal is gone. If it is on the outside, I would try a soft scrub product to see if it makes a difference in a small area.

Try a Magic Eraser.

Use the finest steel wool. It should take very little effort. It the spots are from so kind of hydrocarbon use a solvent with the steel wool.

Use dish washing liquid and borax in warm water.

Use dishwashing liquid and borax in warm water.

Vinegar fully strength works on my let it sit for 30 sec.

Use vinegar

White Vinegar, with a steel wool or similar lad and elbow grease...Finish it off with windex....Maybe also try a scrapper with blade. They sell them at any Hardware or home improvement store. Flat long razor blade...good luck

Walmart sells a great product called the Barkeepers Friend. It comes in both powder and liquid form. I have used both. I use it to remove the water stains on my windows which have been caused by the sprinkler.