I’m afraid that it is not very effective. I have seen these creams advertised as well and I have interviewed some of my patients who have used them.
The consensus is that the results are marginal, if any, at best. The laser remains the gold standard for tattoo removal. It would be wise to consider this as your only option. I have seen too many scars as a result of other attempts at trying to remove tattoos using common household agents.
My advice is to choose carefully where you get your treatment. The technology used as well as the operator experience are crucial to having it safely removed.