comes in powder form. Get a PLASTIC (never metal) rubbermaid or similar container and fill about 3" or so deep with cld water. Add lye powder and mix in, then slip the cast iron in and soak. Zero scrubbing required if you just let it soak a week or so. remove pan , wash with soap and water and if any rust , soak in pickling vinegar for a few hours, then wash again, dry on stovetop and re season .