Folks, I'm pretty new to this forum and just got my second knife: an ER MPC, thanks to all the good reviews I have read here. I love it but cannot help to notice that there is some oil residue like thing on one side of the blade. The other side seems ok. It looked like some stuff left by oil sitting there for a long time. I was not bothered initially but today I just realized I could not get it off. Is this a normal thing you saw on a MPC? If it is not, anyone know how to get it off? Thanks.