Glad you asked...
Getting red dye out of white clothes can be difficult. However, you can purchase a product called simple solutions to wash with your clothes and it will get the stain out.
Then again, this answer might help you...
Red dye is hard to get out of white fabric! Usually soaking in a bleach and detergent mixture in hot water in the washing machine will work. This may have to be done more than once however. Do not dry a fabric that has red dye faded into it. This will set the dye and it will not come out. Deal with this problem as soon as you see it happen!

