The will break down the droppings from birds and spiders with a simple spray! The non-abrasive, non-toxic formula won't harm fiberglass or painted surfaces and won't remove waxes or polish. Safe for use around kids and pets; no bleach. Safe for all marine surfaces and fabrics. DirectionsSpray 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. Won't remove waxes or polish Safe around kids and pets Safe for all marine surfaces | Star Brite Spider and Bird Stain Remover