Removal of Watermarks on WIndscreen or any Glass Surface

I have tried many methods to remove water stain marks to no avail. Fortunately for me I was observing my nephew using the Metal Polish known as Autosol and Spirit to remove minute dust etc before applying the tinted film on the glass surface.

Well used the same idea and tried on the outer surface of the windscreen to no avail. Something must be really long.

I had to improvise the technique that is in concurrent with the Autosol polish, had to use scouring pad and did the trick. Thereafter applied the Spirit to remove with the glass ammonia foam cleaner. Lastly, for long lasting stain free maintenance I used Rain X. Just be careful of the wiper blades.