brokencompass I am personally not bothered much by cleaning coins that have NO surface luster left after long periods of circulation.It should not be a factor for coins lower than high VF. But removal of traces of luster by abrasive polishing makes it hard to authenticate most coins. Many coins after cleaning incorrectly can easily be confused with forgeries so I would never advise cleaning a rare coin.
What really bothers me with reference to "cleaning" are the TPGs that use "hairlines" as an excuse for not grading a coin. Hairlines which they often see as a death sentence for a coin, are a simple fact of life and can result from a coin being in a cloth pocket as well as intentional cleaning.
Cleaning should never be an excuse for not grading a coin - but it should move EVERY cleaned coin to VF level at best. The standard definition of Extra Fine includes a reference to a substantial portion of the mint luster remaining. So if a coin has
no mint luster as a result of dipping or any other cause it starts as a VF pure and simple.