Removes tarnish instantly
Works great on removing tarnish but it does nothing on fingerprint and milk spots, unfortunately that's the reason I bought it for.  The coin appears to be more shiny and it's not necessarily a good thing, experienced stacker might be able to tell the coin had been cleaned.  This product scored a 10 on tarnish removal but a 0 on fingerprint and milk spot.
Rating: 3 stars