After
an extensive review of products that are supposed to frighten birds off boats, including acoustic devices, I finally came to the conclusion that it's practically impossible to keep birds off every part of a sailboat's rigging. I decided that the most effective and also the cheapest method for keeping bird droppings of a sailboat’s decks is with an awning.
This article explains how to make an effective awning using a cheap tarp
1622 words 9 pictures. Price for this article $10