Help me clean my windshield?

Some gunk seems to have come out of the windshield cleaner spray or somewhere and is sticking on my windscreen. The mechanic has drained the wiper fluid container but cannot get the sides clean. Nor does vinegar, nor could the car wash….

I’m not really sure what the stains are or if they indeed did come from the cleaner although it had been smearing quite a bit – even through two sets of new blades.

Anyone have an idea of how to get it clean? It does not feel oily or greasy to the touch.