Recomendations from All Bay Roofing, Inc.:

C
heck all your roof flashings, skylights, chimneys, vents and valleys and make sure they are
free of debris. (branches, leaves, etc.)

Keep your gutters clean to ensure water stays away from your house's exterior and foundation walls. 
Cut back tree branches that might scrub and damage your roof.
 
An annual roof inspection (checking for exposed nails or broken shingles) is recommended.

Do not pressure wash your shingle roof.