Washing Reusable Shopping Bags

We need your help! I got this question and I am not sure the answer. Has anyone had good luck washing these things? Do they fall apart?

"Has anyone tried to (machine) wash the reusable shopping bags yet? I've got some tomato sauce I need to clean off. Obviously the cardboard bottom can't go in the washing machine. I'm not sure about the bag itself though. Google results are inconclusive. (what the bags are made of might matter. I think the cotton/polypropylene blend bags can be machine-washed on cold. The Task Force bags are 100% non-woven polypropylene.)"

-NewsAnchorMom Jen

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