Roofs get more than just rain water on them. Depending where you live, you may find moss and lichen growing on your shingles.
Roofs with moss and lichen growth need to be cleaned. Neglecting to remove the growth will only damage your roof further.

There are risks associated with cleaning your roof, because it can be easy to slip on a wet part of your roof and fall.

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Additionally, there are certain chemicals needed for roof cleaning that can be dangerous if not used properly.