In Florida, roof cleaning becomes necessary sooner than many homeowners expect. Heat, humidity and afternoon storms feed algae and mildew, which show up as dark streaks across the roof and spread a little more each season. If your roof looks dingy, stained or patchy, or your neighbors in Sanford, Orlando, Lake Mary, Heathrow, Mount Dora, DeLand, New Smyrna Beach, St. Augustine, Melbourne Beach or Ocala have noticed the same on their homes, it is a good time to act. Roof rejuvenation is also worth considering when your shingles look tired and faded but you want to freshen them up before thinking about a full replacement.