I would say just keep washing it. Otherwise your next choice would be to dye it again. But if you're going to be using bleach again then you're just asking for your hair to break off and fall out.
Bleaching your hair is very stressful for your hair. Especially if there was hair dye on there before. If the dye doesn't come out after a few more washes, your next options are either to bleach it again (which is VERY damaging, I can't stress this enough) or to dye it again with a darker colour, to cover the old colour.
If you need any more advise please let me know, I'm pretty good with hair dyes!