Artillery fungus, or shotgun fungus, is a wood-decay fungus that likes to live on moist landscape mulch. The worst thing about this fungus is that it shoots spores up to 20 feet, which often land on siding, cars and anything else that surrounds the mulch. This fungus is hard to remove from vinyl, you can lighten it but not totally remove it. It will come off windows with a specialized stainless steel window scrapper. Best way to deal with it is, don't put mulch around your house, if possible.