With all my LinkedIn activities I came across a great individual who holds the patent to a product that might be of great interest to you.
Lisa Holmes has patented the addition of antimicrobial chemicals into plastic cards and tokens. It adds no color to the plastic (e.g. PVC) so it will work for the clear coat layer, it does not wear off because it is embedded throughout the PVC and it uses the same solution already incorporated in other publicly handled plastics like shopping cart handles, medical equipment, pens, etc. Read More→