Coca-cola soak is another option. But not sprite!
Full coke or coke zero? How long for? Overnight or a couple of days or until I remember I left them soaking because my short attention span mea - Squirrel!
When did Vic start outsourcing their manufacturing to Oregon? On a serious note.. WD 40
Also tooth paste or that stuff to clean silverwear and copper. Be sure to wash it after and dry it.
When I work on a customer SAK that comes in like that, soap and a toothbrush is usually enough to clean the tools. If I need more I use scotchbright scrubbies.The liners I wash first, then just sand them with 800 grit wet/dry and then polish and they look better than new.