The baseline for me is vinegar poured over salt, which magically removes tarnish in seconds without even wiping, in some spots. But in others, it doesn't and th

The baseline for me is vinegar poured over salt, which magically removes tarnish in seconds without even wiping, in some spots. But in others, it doesn't and then it takes a fair amount of scrubbing. So what I'm looking for is a way to make the reaction more uniform, perhaps slow it down. Maybe corn syrup.