I spent 20 - 40 minutes with 220 grit and castor oil. All that did was add scratches to the face of my razor.

Since it is a half hollow I think I will go with a flap wheel at 7500 rpm and see where that gets me. If I had the space for a buffer I'd do that, but since I do not. I'll have to go this route. I have done the flap wheel before and had some good success.