I received a badge that was made in the 1980's.
it was a tennis player with 3 stringed racket..worth approx £20.
In the state it arrived it was worth £3-£5.
I used Tcut by gently rubbing it with a soft cloth in a circular movement, when it was cleaned I applied normal car polish over the top of the Tcut. This removes the Tcut and also adds a shine to the surface.If you look closly there is a white dot of enamel paint near the gollies right eye it is still present after cleaning and proves it is the same badge.
I have not tried this on other badges yet but please take care if you decide to have a go !
may work on medals..