Google "Bird Be Gone" and you will see the product I use on both sets of spreaders. 100% effective against small and large poopers. At the masthead I use fishing line and SS wire between the various items up there. Also effective. Sorry I don't have pics. The issues I haven't solved yet are the small birds landing on my lifelines and grabbing the shrouds while stopping for a quick poop. Also beware of nesting birds trying to build nests inside both ends of the boom. I don't have any protection on my radome up on the mast but they don't seem to go there. The little (and big) buggers seem to thinks masts are actually trees. In our anchorage the worst fate a sailboat can have is for an osprey to decide they like your masthead. They drop "bunker busters" on your decks.