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one more from good housekeeping...talks about upholstery which might be close depending what material the curtains are.......

and here's a short video from about.com...again, it talks about clothes, but depending on the material, i think the principles are sound.......

here's clothing and carpets....that's a start
http://www.howtogetridofstuff.com/stain-removal/how-to-get-rid-of-bbq-stains/

quiet night here in p dot :pop