jimmiej,
An old time collector taught me when I first started in this game the following...
Remove grips and soak the piece in kerosene for several days. The kerosene softens the oxidized metal and loosens it. Then rub vigorously with coarse cloth (what we southerners call "croker sack"; repeat as necessary. It is a little more time consuming, but it is impossible to do damage.
Tom A,
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