On Sunday, October 4, 2015 at 3:03:51 PM UTC-5, Bob wrote:
Hello,

Trying to get the gunk and dried up grease out of motor bearings.
Unit is eons old, and armature won't turn easily anymore.

Tried Liquid Wrench, and also soaking in gasoline.

Neither seems to dissolve the stuff.

Anything better ?

Thanks,
Bob

I assume you mean a ball bearing...if sealed, pop the seals off and soak in fuel oil, brush, and blow-out the bear. Don't spin it dry with air! Re-pack and replace the seals.