I'm not a hair dresser, but have colored my own hair for 15 years and also many of my friends. some of my friends have had their professional hair stylists ask where they got their hair colored because it looks so professional. please please please, do NOT use bleach or a stripper of any kind, these can be very hard on your hair, not to mention mess up the color even worse. Just re-color it. I've also done it twice in one day when necessary with no ill effects. if you decide not to do this, you can use a Redken men's shampoo called Go Clean. It won't remove the hair color, but it will help to lighten it up a little so maybe it isn't as noticeable. Good Luck!!!