You've received some good advice here. I like to use a soft bristle tooth brush, like Glen said, with either an Safers insecticide soap or an actual insecticide. I think you may have a bigger problem though, with that medium. Cattleyas need coarse, fast drying medium with lots of air getting to the roots. Your plant looks like it's in some kind of soil. The bugs may be a sign that it's a weak plant because of root problems. I think you should consider repotting along with cleaning up the scale.
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