4 ounces naphtha soap, grated
1/2 pound powdered pumice
1 quart hot water
1/2 cup ammonia
Over Med-low heat dissolve fels naptha soap in water. Remove from heat, Cool.
Once cool, stir the mix and add pumice and ammonia, Blending thoroughly.
Wipe off the smoky deposit before applying the mix with a paintbrush. Let it set at least 30 minutes. Wash Clean with a sponge and lots of warm water.