Do you have any pics of the roof?
We're located in Orlando and do residential and commercial roof cleaning. I don't think it would be that much of a problem, but I need to see what you're dealing with.

All Seasons Exteriors, Inc. Professional Non Pressure Roof Cleaning
Orlando, FL (407) 579-4026 www.floridaroofcleaners.com
Service Areas: Orange County, Seminole County, Osceola County, Brevard County, Lake County,
Polk County, Hillsborough County, Pinellas County, Manatee County, Pasco County, Volusia County
www.roofcleaningforums.com