Musty Smell on Leather Chairs

My office chair is leather and about 3 years old and I am trying to get rid of a musty odor. I've tried wiping it down with Oxiclean, Fantastik, and fabreeze every night for the past week and nothing has helped. I can still smell it. What can I use that is strong to remove the odor?

Alex from Hagerstown, MD

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