I kind of agree with the others, but for the sake of being comprehensive, I suspect that a dichromate/acid 1% concentrated sulfuric acid (add acid to water, never water to acid)
1% potassium dichromate
Probably overkill though..
You will just be substituting deposits, thats how the bleach works.
Just use some house hold ammonia. If it is too far gone, pitch it. It's only a bottle....