Stainless steel quills that mount on the masthead, radar dome or other trouble spot and give birds no place to land. Can be trimmed in size and removed for winter storage.
This collection of cruisers' advice holds probably 100 ideas for keeping birds from pooping on your decks and gear. There are six pages of them.
Products that keep birds from landing on your boat including one that straps to your sail cover.
Removable clips that hold a wire above your boat's railings and bimini supports to keep birds from landing. Works on 1" railings.
Lots of information about pressure washing systems and technique. Much of the information is paid for by equipment vendors.