To gently clean the Celtic horse brooch and preserve its patina, it is recommended to use a soft microfiber cloth or a soft brush to remove organic dirt when dry. For heavier soiling, a slightly damp cloth or a mild soapy solution can be used, but the piece must be thoroughly dried afterward. To ensure the long-term functionality of the pin and to protect the surface, the brooch should be sealed with a special bronze care wax or linseed oil, which will preserve its antique shine and slow down patina formation. Absolutely avoid harsh chemicals, hard wire brushes, or abrasives, as these can scratch the metal and permanently damage the valuable patina.