Roof cleaning Elizabethtown, PA by Liberty SoftWash a call. (717) 578-5342 What causes dirty shingles in Elizabethtown, PA? Black stains and streaks on asphalt shingles are caused by algae growth. These stains are not only unsightly but, they are actually destroying your shingles, shortening your roof’s life span. When it rains, the algae is spread, causing black streaks and stains. If these…

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