From the first two articles it has hopefully become obvious that bleach does exactly that. It bleaches coloured pigments so they are transparent. It doesn’t clean by removing. I was trying to explain this to my son-in-law who said he swore by bleach and used it for many things. Only that morning he said he had used it to clean the tannin from stained teaspoons. Again I attempted to explain that the tannin was still there it had just been bleached so he couldn’t see it. His answer was I cannot s.