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Using honing oil
A whetstone can build up metal flecks and eventually start to damage your blades. To maintain your whetstone, you will need to use honing oil. Honing oil is a mineral oil that helps to flush out those flecks and using it will greatly increase the longevity of your stone and the health of your blades.
Simply apply a quarter-sized amount of honing oil to your whetstone, you don't need much, and gently rub it around the surface of the whetstone with your finger. Continue rubbing until you see the metal flecks start to come out of the stone. Wipe away those flecks with a damp paper towel and then rinse the stone. Dry thoroughly with a different paper towel and you're done!
