Can anyone tell me the most effective whitening soap for you

I am not a Beauty & Skin Care expert. However, until one comes along and notices your question, then you might want to have a look at the bottom of this page for questions that have been similar to yours and click on them to see what the answers have been. I see at least one down there that has been answered a couple of times concerning whitening soap. You also might want to type whitening soap in the rectangle at the top of this page in the search function and see what you might find.