I would try dish detergent, but I doubt there is much hope. I'm going to say you're not going to get it out, so you will have to cover it up somehow. Appliques, patches, or embroidery may be the way to go, but can get seriously expensive quickly. You probably are further ahead to wear it for painting or schlubbing arround the house and purchasing a new one for wear in public. You can find some great things at thrift stores for next to nothing!
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