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Bake it with rf was the final solution after returning it to its mfj case. I cleaned it with dawn and water and let it sit a couple days. I would have to say that it did absorb some of the mineral oil and a slight bit of water. After returning it to its mfj case, the heat from running a 2x10 into it for tuning purposes, had it smoking. At first I was concerned I was burning the resistor itself, but after investigation I found an oil residue around the inside of the case. The case was never near the oil.  Now some of the smoke could have been steam from any water absorbed, but was mostly the oil. So I concluded it was burning off oil residue. I never thought at that time that it could of absorbed it...just figured I did a shit job cleaning it.