This product is very similar to the All In One Outdoor cleaner, but it is a much more powerful version. This high-quality cleaner will remove most stubborn stains, such as oil, grease, moss and algae. If you still have issues with black spots after using the All In One Outdoor cleaner, apply this Black Spot remover neat to the affected areas. Black Spot Remover can be used on various surfaces, such as driveways, paths, patio's, decking and fencing. It can also be used on old headstones to remove deep rooted white lichen stains.For heavily soiled patios we have found that the best method for using Black Spot Remover is to apply the cleaner neat to the patio, agitate it into the surface with a brush, leave it overnight and powerhose any residue off the next day.