I need help finding a restoration service, or cleaning tutorial.

I am getting an Apple Macintosh SE/30 case, which when I get it, It will be slightly yellow, and have minor dirt stains on the casing and inside metal, I just need help finding either a cleaning service that restores old tech, or a tutorial or cleaning solution ideas for trying to do it myself, to either get rid of the slight yellowed casing tinge, and just minor dirt stains on the casing, I was originally thinking of putting it in a huge tub of water with hydrogen peroxide in it, but any ideas anyone might have will help, thanks so much, need a response asap!