Glass spots - how do you remove them?

Are you absolutely sure that there isn't a tint film on the windows ?

I suggest that you visit an auto glass specialty shop.
That's REALLY bad and you might have to replace it.
Might be etched INTO the glass instead of just ON it.

 

Vinegar & newsprint. Something about the hardness of actual newsprint works better than a lot of other wipers.

 

I wonder what the spots are - wondering if it's poorly applied RAIN-X - or old RAIN-X - which I've seen go like that.

 

I had a minimal hard water spot situation earlier this summer after a brief rain spotted up the dust and the sun came back out and welded it to the glass. I found a Windex product that has vinegar in it and after a couple three days of wiping it down with regular old paper towels the spots were gone. OP has a much more developed deposit as seen in those photos. Might try some Lime Away diluted on a wet sponge.

 

This is for outside glass:
Get a Mr. Clean magic eraser (or generic) and use your favorite glass cleaner. Activate the magic erase by running it warm water, then squeezing the water out. Spray the glass cleaner on the magic eraser and the glass. As you slide the magic eraser , make sure the magic erase is not dragging, make the glasswell lubericated with glass cleaner. Repeat as necessary . Then use the same glass cleaner and a microfiber towel (or lint free disposable towel) and clean it up. Done.
Option:
Use your favorite wax and apply wax on it to prevent future water spot build up. Also will make your glass hydrophobic and rain just runs off.

 

It wasn't intended to be funny.
I am absolutely serious.

OR.....you could just keep screwing with it until you make it worse.

 

Have you washed the car since these water spots?

I only ask as your post does not mention a car wash.

In the past I have had water spots once, maybe twice and it was due to washing,
but then not shammy-ing it afterwards....just leaving it to dry by air.

But once I washed it again (using simple basic el cheapo car wash soap) water spots were gone
after drying with the shammy (cheap artificial chamois) cannot find brand online since im working atm.
But not the sham wow or whatever.

 

I do know that glass top cleaner works, as I used it on my stove

But I am just curious if you have been drying the car after the wash/rinse.
or are you letting it air dry wet?

The reason I say is that the water spots are more than likely from "hard" water which is lime etc...(im sure you know)
But air drying it is letting that hard water with the minerals dry on the surface.
If you had dry it with cloth or squeegee or towel or something, it will take the minerals too.
May take one time or multiple.

If that does not help, then yes the water spots are serious and a brain stumper

 

A college housemate swore by jeweler's rouge to remove water spots. But that was many decades ago, and I haven't heard any followup discussion, so read up from modern resources before considering it.

I wouldn't have used Comet, it probably added scratches.

 

If you like the rouge idea, get something specific: cerium paste.

That's what people used to use to remove those annoying micro scratches from windshields. (and still do, for rare cars with unobtanium glass parts)

It's very labor intensive, which is why it isn't so common anymore.

 

windex or another brand of glass cleaner is usually a go to option for spots on the windows.

A clay bar also works. There used to be, possibly still is a product called Perfect Vision specifically for glass that includes a clay bar, and uses is the same concept as clay bar for paint.

It's a similar concept as fogged up headlight lens or eye glass lens with crinkled coatings. Not really much can be done with them in one of two buffing sessions or product applications. In my experiences with scratched glass, I've had to keep buffing and keep adding a clear filler to the scratches seems like forever.
New glass always works !

@alanclarkeau I've also seen old rain-x paste up or completely dry out over time. It's hard enough to polish rain-x to a clear gloss when it's a liquid, and when it drys to a gel in the container, it's about 3 times as hard to buff out.

 

And yet you seem to ignore my suggestion that you consult a professional glass company.
Why is that ???

 

That's exactly what I use too.

 

I think you are in a bit of denial here.
Taking all of the information that you have provided, I think the logical conclusion is:
Those spots are NOT on the outside of the glass but are on the INSIDE, maybe between the glass and some tint film.
Continuing to scrape away on the outside likely will do some damage eventually........if it hasn't already.