Black, green, and even red mold can be a perpetual battle in environments starved of sunlight. That means the shady north side of any building is usually the first aspect to develop a mold or mildew problem. If you don’t own a power washer, try an outdoor-strength fungicide sold in a hose-end dispenser. Simply hook the bottle up to a garden hose, turn on the water, and wet down trouble spots for easy rinsing and cleaning. These are great for hard-to-reach exterior walls and siding, as well as for horizontal structures such as decks and driveways.