... I was wondering if there is such a thing as a mild cleaning or treatment that would remove this very early start of blackness.
If you don't like it try a little liquid hand soap and water, rubbing the area
between your fingers, then rinsing thoroughly.
It doesn't get more (or should that be less?) minimal than this. A lot of so called "silver toning
" turns out to be nothing more than accumulated dirt and grime.