miws
Also, regarding the flyers; yes, call the office of the organization.
I worked in the parking business for 15 years, at various locations in the Downtown Seattle Business District.
We would occasionally find flyers on the cars (surprisingly rarely, actually), and of course not only were they a nuisance for our customers, but for us as well having to go around (if we had staff to do so) and pull them off, or pick up the ones off the ground that our customers yanked off their cars.
What I would generally do, if there was a phone number, would be to call them up and inform them that they were not welcome to do so, and in fact that they were trespassing on private property.
At least once, or twice, when there was a mailing address on the flyer, I would generate an invoice, on the actual form our company used for monthly parking billing, and mail them an invoice (made up amount) for the removal and disposal of the flyers, along with, I believe, an admonition for trespassing. Looked pretty official when I had my typewriter, and generated it that way, as opposed to hand writing one.
I was never expecting any response, and certainly never any payment.
But, I think I may have actually received one payment, and probably had to call our office to ask how to process it. :-)
Mike