I have read about some issues with bugs that might be attracted to mayo or milk, but I haven't tried them. I used lemon juice, and maybe I used too much, but that left stains on my orchid leaves as well???? I have had good luck with "Rise and Shine" from First Rays
Rise & Shine - Quart Spray Bottle $10.00 Other First Rays I grow orchids for myself and don't show them, so I don't absolutely have to have orchids with clean leaves, but, I can't imagine dust on the leaves is a good idea. I have a fireplace insert (also a humidifier) and burn wood leaving lot of dust that I have to clean up; and in the spring and summer there is pollen and dust from heaven knows where. I clean my orchid leaves every couple of weeks or if they look really dusty. I don't spray the whole plant though, I think that would use a lot of spray and leave a mess in my living room. I spray some on a small piece of clean paper towel and clean the leaves of one plant at a time adding a little more spray as needed--then I use a new paper towel for the next plant. This takes a while but is well worth the effort. I get to inspect each plant, and I love the clean slightly shiny leaves. If only they would stay that way for a while!
Cleaning leaves
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