At PostalAnnex+ in Long Beach, we take professional US passport photos, accepted by passport processing agencies. Most stores accept walk-in's, so no appointment is needed, but call the phone number at the top of the screen for your passport photo needs.
This silver sulphide tarnish can be quite easily removed using polishes that contain abrasives to rub off the silver sulphide, but these have the disadvantage of also removing small amounts of silver. Handily, chemistry provides a method which sidesteps this problem.
Here are some Q&A threads on the subject if you wish to read still more: 1  letter 779c - tarnish removal and prevention. 2  letter 1293 - Lab technique & safety, cream of tartar, toothpaste, Microscrub, vinegar + salt, hot sauce, ketchup. 3  letter 2650 - bleach. 4  letter 2867 - cola, Sprite, lemon juice.