I'm afraid washing in any other way than hand-rinsing in a sink of warm water and then hanging to dry is gonna result in a jelly roll you will not be able to use. Every jelly roll I've ever seen that was put in a washing machine -- even on "delicate" has been a frayed, matted up mess. (I saw at least a dozen, maybe more, working at JoAnn's -- people would wash them and then bring them back for a refund when they had ruined the roll by putting it in the washing machine.)