How can i stop my vagina from smelling?

I really dislike the (pardon my bluntness) fishy smell my vagina gives off, after masturbate or generally have my hand or fingers down there I naturally smell my hand and I know that slot of other people do it but I hate the smell. I wash it well when I shower or bath, I use non fragrance, sensitive skin soap and I make sure not to be too thorough though because I heard it can be bad. Anyway sorry for the essay but can someone help me find a way to astleast make it a milder smell?