Water spots on glass.

I'm an old man, so I do it the lazy way.

Put on some dishwashing gloves, take some 0000 steel wool and soak it with pure CLR lime remover/cleaner and lightly scrub it all away. Wipe the CLR off with a moist towel, then give it a quick spray of Windex and wipe with paper towels. Your glass will be as clean as new!

Diluted CLR is also great for cleaning house windows too! It works 10 times better....and 10 times faster than any glass cleaner I have ever seen.