All contestants shall be clean and present a tidy appearance. It shall be at the sole discretion of the commission or its representative to determine whether facial adornments (mustaches, goatees, excessive sideburns) and length of hair presents any potential hazard to the safety of the contestant or his or her opponent, or will interfere with the supervision and conduct of the contest. The excessive use of petroleum jelly or other similar substances shall not be permitted and such substances shall be applied to the face only. Referees or the commission representative in charge shall cause any such excessive substance to be removed.