How to really clean large windows - any advice?

How tall is the top of the window?

Use a very very lightly soaped rag and a good quality squeegee. Use Unger or another brand, Home depot sells them but they are the mid grade ones. You don't want too big of a squeegee 15-18" max or they don't do as good of a job. Also, don't get the squeegee and rag in one thing they sell, those are terrible. Time proven and never beaten method. They make some specialized rags

Step stool, I thought we were talking something 20’ off the ground

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Use a very very lightly soaped rag and a good quality squeegee.

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What this poster said. I have a large 2 story house with 31 windows in it and they are all the old style wood sash, double hung with most of them with only 2 large panes per sash.

I use a soap water solution to wash, have my hose close by and rinse off the soapy water and then use a squeegee to remove the water. Works like a charm for just about all the dirt that accumulates on the panes.

mop and a squeegee

You can use a soap like Palmolive to help with hard water marks. I found rain x treatment helps but doesn't last long.

use this soap LINK

with the same brand squeegee and scrub pad. I have ALOT of windows and would take an entire weekened to get them good and clean until i found this stuff..