Hand wash the strap in the sink, holding the metal medallion out of the way. You can use soap, or shampoo, or detergent, I'd use a very tiny amount. Hang to dry.I have an old lanyard that is like the lanyards worn by CMs in the park with a medal. It's not a bolo or starter pack lanyard.
How can I clean the strap and the medal without causing corrosion/discoloration of the medal?