Most of the food remnants can be wiped out of the container with a paper towel, which is then burned.

From what I understand, the 'washing dishes with sand' is just an old tale. It's not going to take the grease off, and guess what rancid grease is going to cause? Yep. Cowboys were hard workers, and they couldn't take time off every twenty minutes for a bout of diarrhea.

Sue