You also might try patting it down with a dryer sheet. That should remove any loose dust. But again, try it on another pennant (made with the same material) that you don't care about first.
"...You just have a wider lens than one game."
--Former Reds GM Wayne Krivsky, on why he didn't fly Josh Hamilton to Colorado for one game.
"...its money well-spent. Don't screw around with your freedom."
--Roy Tucker, on why you need to lawyer up when you find yourself swimming with sharks.