Web Out, part of our Nature's Element line of EPA 25(b) exempt products, kills spiders and prevents spider webs on any surface that may support? spider web development. Web Out can also be used as a contact pesticide to kill ants, crickets, mosquitoes, cockroaches, perimeter pest insects and other general pests. Web Out can be applied as a surface application to kill and prevent surface fungus such as mildew. It can be applied to metal, wood, painted ?surfaces, brick, stucco, fiberglass, concrete, paneling and other surfaces.?