Nustock cream contains sulfur powder, pine oil, and mineral oil. The sulfur can treat mites, ticks, fungus, and bacteria, while the mineral oil can suffocate the leg mites. Some use it for vent gleet, wounds, as well as leg mites. For my rooster that suffers from leg mites, I usually use Crisco shortening in a can, once a week applied and rubbed into the scales. I have also used other thick oils. Castor oil is a good one to use, and it is less messy than some. I don’t think it matters exactly what oil to use, but the leg soaking and gentle scrubbing of the scales is something I skip.