h1. Oil Treatment for Agate Stones Agates have natural banding, caused by glacial action. Agates do not need to be cut nor polished. h3. Oil Treatment Clean the agate thoroughly with soap and hot water. The agate can be enhanced through a process known as _treating._ The hot water heats the specimen and slightly opens the tiny surface micro-cracks. The next step is to dry the agate with a towel.