Getting calcium off with wfp

Hi ide like to know from anyone if i can get this calcium deposit off this three floor job with a water fed pole and some chemical
Theyve never been cleaned and the deposit seems to have been burnt on to the glass like clay in a kiln

That looks like a job for some good old nose to the glass elbow grease.

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Ahhh so no chance wfp
I looked at the access to thr area no way of getting boom lift into the place

test the following:
cleaning vinegar 10% NOT table vinegar
barkeepers friend
either can be applied with pole and rinsed off with pole

Bar Keepers Friend has a foam type and a powder.
Any chemical can be add to a hog hair brush to do window higher up.
I carry about 20 different ones in the van.