An inexpensive kitchen tool that looks like a miniature rag mop made with absorbent white strips. When a grease mop is brushed over the surface of a soup or stock, the strips absorb floating grease. Grease mops (also called fat mops) are available in specialty gourmet shops and the cookware section of some department stores. They may be washed with hot, soapy water or placed in a dishwasher.