WE know our field, let us be the experts and trust us. I should ask, what do you do for a living and then start telling them the proper way to do their job. Its very strange indeed. I do not call these people customers because they are non customers for roof cleaning in the NW. WE know roof cleaning and roof maintenance. Questions about roof cleaning is good good good! I love to talk about it. Some people just need to realize, they should not own what they cannot afford maintenance on. LOL, half joking.