Water is the best thing to use. Spray thoroughly then wipe off with a damp cloth. A piece of an old T-shirt works well. Anything greasy like mayonaise or sticky like a banana peel will just attract more dust sooner. Mother Nature uses water to clean all her plants. How can you improve on that!
I don't remember reading about this in ThriftyFun but ages ago, during the 1950's people used to put a little mayo on a cloth and dust their potted vines such as pothos, philodendron, etc.
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