How do you safely clean human skin oil buildups and dust residue layers off the delicate velvet pads of studio audio headphones?

Unclip or slide the velvet ear pads off the plastic headphone assembly housing. Submerge them in a bowl of warm water mixed with a small teaspoon of gentle wool liquid detergent. Squeeze the soapy water through the foam cores gently by hand rinse thoroughly with cold tap water blot dry in a clean towel and air dry completely for 24 hours.