The constructor brush being all Boars is going to have a lot of drag.
If you don’t already have one, get one of these ladders. It should give you the height while still remaining stable to get the leverage for those top panes.
What I have done in the past is take before and after photos, then I keep in touch with the realtor or watch the realtor.com website to track the sale. Once it is posted as sold, I usually wait 45 days to make sure the closing has been completed and then I will snail mail the new owners with the before and after photos printed from a Word document and included with a quote for future maintenance cleaning. (You can also look at the county property appraiser or tax collector’s website to get the new owner’s name rather than addressing it to a generic “New Resident”). This will show the new owners what the house would look like if they “neglect” it and what it would cost to prevent it ending up the way it was.