That's one of the reasons i'm going "realtor direct" with the fliers. They can then recommend the homeowner to get it done. The 20% discount for listed properties is a value added service the agent can tout to their customers ( kind of like:hey, by having your property listed with me, I can get you a 20% discount on this service by Spray Wash).
Distribution isn't too hard, its a joke to try and get them to every agent, since 20% of them do 80% of the business. I'm just going after the large offices, and the single top and mid level producers. Make nice with the receptionists and she'll stuff everyone's in-boxes for you!
BTW - Some fliers went out this morning, and booked my first job by 11:00 AM