Dust and oils can build up on the leaves of your plants, blocking light, making it difficult for them to “breathe” and increasing the risk of disease. For large, smooth-leaved plants, a wipe-down with a moist cloth works wonders. Plants with small or narrow leaves will benefit from a rinse from the kitchen faucet sprayer or a quick turn in the shower. For hairy leaves, such as those on African Violets, employ a soft toothbrush gently,