How to Get Rid of Artillery Fungus
Artillery fungus, also called shotgun fungus, appears as little brown spots on the siding of your house or cars. The fungus comes in as little spores, usually in organic mulch, rotted wood, or dung. The spores gather water and explode in cool spring weather, shooting pieces of itself up to 20 feet. These pieces adhere to walls with a sticky substance, and although they will not cause any structural damage, cause an unsightly mess on the surface. The spots are very difficult, and sometimes impossible, to remove without damaging the surface underneath. With the right tools and knowledge, however, you can remove the unsightly spots as much as possible and prevent their recurrence.
Use steel wool or a scraper to scrape or sand off each dark spot on the surface. If possible, choose a tool for this job that will not damage the surface underneath. A stain will be left underneath each spot.
Eliminate the leftover stains by using an ink eraser. Go over each spot until it disappears. A mild soap and water may also help with stain removal.
Remove the source of the fungus to prevent future attacks. If you have organic mulch within 20 feet of the affected area, this is probably the culprit. Replace the mulch with an inorganic mulch, where the spores cannot colonize. If there is no mulch around, look for any rotting wood or other moist organic matter.