Commercial / hard water stains

It’s a three story building hasn’t been cleaned in years so it’s got some hard water stains. I’m not wanting to do a lift so I was wondering if anyone has a good way to apply chemicals up to 2nd and 3rd floor and use a wfp.
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Lift; Ladder; Boatswain Chair.

I was thinking more along the lines of scrubbing and rinsing with a wfp, just need a good way to get chems on the glass.

You could try using 2 wfp and have the chemical in line with one of them and rinse with the other.

Do you know what kind of apparatus would be needed to send the chemicals up the line?

Looks like there are different kinds of soap injectors and such online, but I’ve never used one personally. You could also use something like the Gardiner backpack and mix the chemical into it.

WCR also sells something called an xjet, it’s for soft washing and you use a power washer. Could be an option, but I don’t really know how any of that works.