Do you have Stripeez-Paint remover? That will brake down the sap resin burn to clean the head on your Oge. let it soak for 15 miniuts-whipe off-and use Paint thinner to do your final clean-up.Also , just so you Know, This will also reomve the paint finish on bit.
After that is finished you should use a very fine round ((not square(-roman Oge))sharpening stone- If it is a flute- use the flat smooth stone,use the same amount of strokes with the blade facing away from you -pulling over the stone equally on both sides to try and get a uniform shape from the sharpening!
good luck!