We do minor tree trims to and can mulch this excess into garden mulch.
Typically tree trims are done to cut back overhanging branches which are dropping debris directly into them. It keeps gutters clear for longer as well as allowing sun to access the roof to avoid it getting and staying damp.
Done with either a pressure cleaner or a water fed soft bristled brush. Depending on certain factors including the material and condition of the roofing.
We can seal different types of surfaces to keep them from weathering as quickly.
There is a lot to know about sealing depending on the desired effect and look.