You could also clean his neighbors house for free and start on it the same time he starts his.........as he is on his 3 trip down the ladder to be refilling his 2 gal pump up you will be rolling up hoses and pulling off with a job well done and still have the rest of your weekend.........Just to prove a point to the dude.
Larry
I would wait until he cleans the roof and visit the landscape.....pumping a contractor for info is BS. Homeowners vs landscapers are the best example.