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<p>[QUOTE=&quot;WillB, post: 4448779, member: 112408&quot;]My secret reply - don&#039;t touch any proof coins.&nbsp; Nothing you do will work and you will destroy the value down to melt.&nbsp; However, for circulated coins there are some tricks - the only oil that works is the oil on your forehead.&nbsp; You can use this on coins to gently get rid of marks but do not then go and wipe it with a cloth!&nbsp; I have had no bad results with this even after years.&nbsp; I welcome other people&#039;s experience but this oil is used in the finest clocks for the most delicate mechanisms.&nbsp; On copper that is not overly valuable and may be grubby and not choice lustrous EF+ I use the same treatment but I have soaked coins in virgin olive oil to loosen the dirt -in Irish coins dirt seems to adhere to the line that represent the harp strings - mixed results.[/QUOTE]</p><p><br /></p>

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