Droppings from birds and spiders ruin the looks of any boat and can't be removed with just soap and water. But just spray on Star brite Spider & Bird Stain Remover and they'll begin to break down instantly. The non-abrasive, non-toxic formula won't harm fiberglass or painted surfaces and won't remove waxes or polish. Droppings dissolve without hard scrubbing.
Spray directly on droppings, saturating them. Allow it to penetrate the droppings for 30-45 seconds before gently scrubbing with a boat brush. Rinse well with fresh water. Stubborn or sun-baked droppings may require a second application. Test for effect on color in an inconspicuous area before proceeding with overall cleaning.