Thanks for all the great tips everyone! I wouldn't put jelly roll pieces in the dryer either, but I handwashed them several times, used vinegar, and they still bled a bit. I may just use them for projects that are either tonal or not that important to me.
I ordered a Moda jelly roll and hopefully that will work out better and not bleed.
I'm also looking into retayne and purchased the colour catcher. Thanks for all the input, this thread has been very interesting!