Recently had this whitetail skull beetle cleaned, "supposedly degreased" and whitened. It was a fresh skull taken in right after harvesting, I skinned it off the skull and left with person to be beetle cleaned in mid November, just got a call and picked it up this week. There are several large areas with a significant grey coloration. Not nearly as white as a couple I have had done in years past, both beetle cleaned and boiled are much whiter. Is there anything that can be done to correct it, or chalk it up to bad experience? Thanks in advance for any suggestions!