Thanks, soapbuddy and busybee! I think a little pumice or cornmeal or something might be called for, just not an over the top amount.
Turpentine, eh? That led to a couple of interesting recipe ideas... one supplemented with orange EO, which I suspected might be helpful for this task, but that recipe is a sort of liquid soap made from grated soap, so the EO wouldn't be getting cooked out. I was pondering if the cleaning power of the orange would be wiped out in CP. Maybe something to try as HP or rebatch?...