I agree. Half of the time it's some guy who just wants to the coin a service. Whoever holes a coin does not have the coin's feelings in mind.
I've used DISTILLED WATER to steam the filthy pieces I've had and will give any tough cases an ACETONE DIPPING to see if they can be helped.Hope no one will try to tell ME I can't!
Those tricks work exceedingly well with crusty roman coins - which are worth 50 cents before you clean them and 51 cents after...
Welcome back Swish atleast I haven't seen you in awhile. Still sling beer at the park? As to the op depends on severity of the cleaning
A medal isn't a coin. And if the particular medal is made [manufactured] with a hole that's another story.