Best Way To Clean Coins From The Mint

I'm having trouble with the comments of "don't do it". These commemorative dollars are arriving with the black "velvetine" fibers on their surface. Some have grease smears. The presumption that these contaminants will never affect the surface of the coin is merely an unfounded guess. The mint itself removes contaminants and then uses robotic machines which pick up the coins puts them in the airtites and processes the packaging. The black fibers enter the capsules sometime after the final packaging, probably when rapid air pressure changes occur in the cargo hold of an airplane. Not removing the fibers, nor the grease spatter, is not a reasonable option for the future of an otherwise perfect coin. Even the TPG would remove these before slabbing them. So, I really can't wrap my head around these no-no comments.