Get a bottle of Dr.Bronners Peppermint Soap (Organic). Mix 1 and a half Tablespoons of the soap in with 1 gallon (3.78L) of warm water. Spray the plant down (Soak it) A couple times a week with a spray bottle of the solution. The Soap actually penetrates the scales shell and kills them on contact. You will still have to scrape them off with a cotton swab or toothpick as they are still on the plant after being dead. I have a large Cymbidium that got a bad case of scale on it and after 2 treatments of Dr.Bronners it is gone. I still treat all my plants once a months to the solution because bugs don't like the smell of Peppermint and it keeps them away.
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