Roof cleaning 2016. the warm temps. we are experiencing this spring has allowed Kleen llc to start cleaning roofs. This roof did not have what would be considered a heavy infestation of the algae, (the black streaks) it was enough that moss had started to grow on the shingles. Not only was the curb appeal of this home being ruined by the black streaks, the moss could lead to damage to the shingles. The owners made the right call, and contacted Kleen llc to professionally treat this roof.