I know everyone has their own opinion, but this is mine. I would soak in Oxy clean or Biz and then rinse until the water is clean. Gently roll each one between towels to remove excess water and let dry flat. I wouldn't worry about the age-looking part (that's the beauty) -- just remove as much soil as possible. I would hope no one would want to wash me until I looked new. Yikes! I'm 71 -- lots of age spots, etc. LOL
EDIT: What's Orvus soap?