Ike dollars not really special the other 3 are silver dollars %90 and have a melt value of at least $20.
Nooo...don't ever do that! Don't joke about it either, please. Do not wipe a coin with anything. Soak in distilled water or pure acetone only. Air or pat lightly to dry. Thank you in advance.
The age of the dust is inconsequential to the damage it'll do. The act of rubbing the coin with the ShamWow or any other material can put micro abrasions into the coin. Even with no dust. Add the dust to the rubbing and you're just giving the abrasions more ways to occur.