Yes. We would probably have to pass on this job.
But seriously, the before and afters are below.
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Before: Heavy Black Algae Streaking

After: Cleaned

Extreme Moss

After: Cleaned

Extreme Moss

After: Cleaned

Before: High Levels of Black Algae and Lichen

After: Cleaned

Before: Heavy Moss

After: Cleaned

Before: Black algae, mold, moss

After: Cleaned

Close-up Before

Close-up After

Black algae and moss infestation

After: Cleaned

Before: Black algae, moss, and lichen growth

After: Cleaned

Before: Black algae, moss and lichens

After: Cleaned

Black Algae streaking

After: Cleaned

Before: Black Algae, mildew

After: Cleaned

Before: Black Algae and Moss

After: Cleaned

Before: Moderate Black Algae Streaks

After: Cleaned