Cleaning windows at a new school

There’s 1714 panes-all have stickers all over,and they are just really dirty( obviously-new construction).
How should I price this,$ per pane?? Was thinking $12.00 per pane[inside&out].$6.00 per pane for the smaller ones.
Highest pane is 2 stories,and they range from 3’x4’ and 4’x2’, also smaller panes at 1’x3’.
Easy access to all windows,there’s no cement or anything on them,just very dusty and muddy from the pressure washer guys cleaning the brick.
I will take some pics tomm.