What kills bugs on indoor plants? DWQA Questions › What kills bugs on indoor plants? 0 Vote Up Vote Down Allan asked 4 months ago Is there anything you can put on a plant that will keep bugs away from it for a long period of time? 1 Answers 0 Vote Up Vote Down Nicolas Wayne Staff answered 4 months ago Yes. Soap or fatty oil (such as vegetable oil) sprinkled around the plant will discourage bugs from landing on it, because they don’t like to land on oily things. Soap or oil may also keep ants away.