If your roof is showing signs of mold, then a cleaning might be warranted. If your house is less than 10 years old, I would call home warranty first to see if there are other options. In any case any cleaning should be LOW pressure and with appropriate cleaning agents by a licensed firm. Ours is almost 9 years old and shows no signs of needing to be cleaned.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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