I have the opportunity to get some old burlap bags. These are the kind that coffee, oats, feed, etc came in. I'm thinking of making reusable grocery bags out of them. I know that they will need to be washed to remove any thing that might have been in them and to help soften them. I did a google search and found conflicting info about washing them in the washer vs hand washing. I'm hoping someone has washed some and could give me their opinion on how to do it. Thanks!