Brew very, very strong coffee....either espresso or just triple the amount of coffee granules you put in your maker. Pour into a spray bottle and if using espresso...I add some water to it, because I have a Tassimo and the wee cups it makes are just not enough. Add just a quick squeeze of dishsoap and shake. Spray all over the leaves of your plant and respray after a rainfall. They just fly away and maybe the odd one you'll have to flick off, but it seems to work very well for me!