After cleaning my RW fretboard, skin oil remains where I play most often. You can see the pattern from across the room. The lemon oil I use cleans the surface, but does not remove the finger-stained areas....just makes them proportionately darker. Would using mineral spirits/naptha, or Murphys Oil Soap, or some other pre-treatment before the final treatment get those oil stains out ? I'm planning to start using F-One oil as the final treatment at the next cleaning..