The term 'USES ELBOW GREASE ON' can be summarized by the crossword solution 'RUBS', which means to apply pressure and friction with one's hands in a circular motion. This is often done to clean or polish an object, such as furniture or jewelry. Elbow grease is an idiom that refers to the effort and hard work that is required to complete a task. Therefore, the phrase 'USES ELBOW GREASE ON' implies that someone is using a lot of effort and hard work to clean or polish something.