To prevent discoloration, mold, or cracks, avoid using a dishwasher, dryer, or microwave, soaking in water, using abrasive cleaners or scrubbing pads, and exposing the tray to direct sunlight or high humidity.
For maintenance, occasionally apply a thin layer of vegetable oil, wipe off the excess with a paper towel, and let it dry for a day. With continued use, the tray will develop a richer color and a beautifully aged character.