I guess you need to figure out how bad the ball track looks. Usually your ball will have an area more worn where the ball lands on the lanes. If you can see a track pattern around the ball I'd go get it sanded. Low grit matte balls I think take the most work to keep the same. Everytime you throw the ball your smoothing the cover and oil is basically polishing. You could wipe the ball with a towel before each throw to help. Cost I really don't know my pro shop never charges me but I think 5-10. If I had that ball I'd try a green scotch brite but going to the pro shop would be best chance to get the same grit.
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