I wash them off with soapy water and spray with neems oil with baking soda and dish soap. I make up a 1 qt spray bottle as directed with neems and add a spoon of baking soda and a squirt of dish soap - very accurate, I know. Baking soda is supposed to help with fungal diseases and the soap helps emulsify the oil and cling to the leaves. Neems can burn the leaves in hot weather, so be careful.
