I could not be happier with the Cory Super High Gloss piano polish. It goes on very fast, simply, and wipes off without ANY residue. I once tried using McGuire's 2 step plastic cleaner/polish in a small area on the back of the piano and I could never get the residue to go away even with buffing. Check Amazon reviews on the Cory high gloss product as the reviews are very good.
Happy Holidays!