I know about the what-is-the-best-way-to-remove-and-prevent-leaf-stains-on-concrete-pavers question and its answers, and I'm trying to revive it and continue the search for the perfect answer.
I'm in a similar situation - a new patio was paved by concrete pavers from Cambridge (I didn't know they were porous) and I've left wet leaves on it for a couple of weeks (I didn't know about tannin stains).
However the question above is from 2010... Are there any recent achievements in chemistry, which will allow me to remove these tannin stains, or at least to decrease their dark color intensity? I have found references about "Genesis 950" and tea tree oil - do they really help?
UPDATE: I'm emphasizing that the question what-is-the-best-way-to-remove-and-prevent-leaf-stains-on-concrete-pavers, mentioned in the beginning of my question and also pointed out as a duplicate, is five-years old, and so doesn't contain most recent information about various chemicals, which I don't know about, but may be somebody here does. I've also given two examples of agents, which weren't discussed in this question.
Additionally, it looks harsh to me to point me to the question, which I myself have addressed in the beginning of my question and pretend this question solves all my problems (it doesn't). I've already tried some ways to remove these stains (dishwasher detergent, OxiClean), but they are still there.