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Message:: [QUOTE="imrich, post: 3068255, member: 22331"]I believe you've simply argued my case that the majority of coins have been cleaned. Many as when using Acetone without any mechanical contact that haven't generated an adverse conditioning of the coin. I believe it can be proven that the finest rubbing of a coins surface by man-made fibers, as with a gloved hand can alter the surface of a coin. I've experimented with various atmospheres, materials, patterns, pressures to ascertain that normal handling of "coins" can alter a the surface. The normal handling process can produce abnormalities as "hairline" scratches, prints. Effects that are seen on many coins, described as "bag rub", "toning", "scratching", "coin-clash". Some in this venue have complained these alterations as being intentional/accidental by TPG processing. If surface alterations aren't in a pattern conducive to appearance improvement, it may/should be argued natural.  To prove a point, because of an arbitrary declaration by TPG, valuable coins receiving a cleaned statement were posted on this site at virtually melt value, without response. I documented when one of the coins was resubmitted to opposition it received a grade significantly different, increasing the stated value several thousand dollars  A check list for cleaning justification/declaration would be quite simple, generally allowing less ramification than a grade change. JMHO[/QUOTE]