You Can Make Your Money Crisp by Ironing It: Ready for a surprising money fact that involves a little bit of fabric know-how? If you’ve got a creased, crumpled, or wrinkled dollar bill, you can make it look new by pressing it with your iron. As mentioned earlier, U.S. dollars are 75% cotton and 25% linen, so it’s fabric. To iron the money, dampen the dollar bill slightly with a spritz bottle, sprinkle water by hand, or use the spray function on the iron itself. Set the iron to low heat, put a towel under the bill and another on top of it, and then iron the money in a circular motion. Set aside to air dry. Presto! You should have a nice flattened bill.