What's the best way to clean up these sun visors. They're original and in perfect condition, but filthy.

Found them stashed behind the seat which is great, but they're naaaaaasty lookin.

Any tips would be appreciated!

 

Most old grime that's been on for yrs won't come out. So do the next best thing get some VHT spray dye from Auto-zone try using a good degrease or dish soap and a old tooth brush first rinse and dry good before using dye.. orich