I've had my favorite sweatshirt for a few years. Because I live in Arizona I only get to wear it for maybe 2 months out of the year. So the other 9 months it's stuck in the back of my closet. This year I pulled out my sweatshirt and it is incredibly musty. I've washed it a bunch of times but I can't get rid of the smell. It's still cold out (cause of global warming?) and I want to wear it but I don't want to stink. Help?