Quote Originally Posted by David Lyga View Post
Acetic acid, which is twenty times as powerful as white (hops) vinegar can, indeed, be used, but I should have said that one should first impregnate a bit of clean tissue, or a Q-tip, with it and NOT apply it directly to the battery contacts. I have yet to have problems with this method. Sometimes the vinegar is simply not strong enough.

But, other recommendations are also good, even the one using a pencil eraser. And, as far as getting 'bits of steel wool' into the meter: one assumes that all the debris will be wisked away with a small brush before those gremlins get a change to get inside. - David Lyga
David, that's an unsafe assumption. If you never get the debris near the device, it will never cause a problem. That's a safe assumption. A meter with an analog display, that is an electro-mechanical meter movement, has strong magnets and will attract steelwool fragents rendering the movement inoperable.

A fiberglass scratch brush, made specifically for cleaning contacts is probably the safest route.