Sharpening stones, whether water, oil, or diamond-based, require their own maintenance to remain effective. Clean stones after each use to remove metal filings and slurry, which can clog the surface and reduce sharpening efficiency. Flatten the surface regularly with a lapping plate or leveling stone to prevent uneven wear. Store in a dry environment, and if using water stones, soak them before use but allow complete drying afterward to avoid cracking or mold growth.