To restore a molcajete, follow these steps:
1. Scrub the surface with warm water and a brush to remove any loose debris.
2. Use coarse salt to create an abrasive paste and scrub the entire interior and exterior of the molcajete.
3. Rinse thoroughly and let it air dry completely.
4. Repeat the process if necessary until the molcajete is clean and free from any stains or odors.
5. Apply a thin coat of vegetable oil and let it sit overnight to season the molcajete.