If you still have the receipt - I would still try to return it even if it was washed! If it was sold as first quality goods, then there should be no hassle if it isn't. (Operative word here is "should")
I can deal with flaws if I know about them ahead of time (although it infuriates me when the clerk/associate tells me I can work around them - maybe I can, maybe I can't - I know quite well what I'm willing to work around)