If there is nothing else available I'll use my licence, but I much prefer to crush whatever it is inside a sealed bag with a lighter or back of a spoon, or use a razor blade on a glass dinner plate or nice clean glass-topped coffee table. Where I am from, our driver's licences are issued for ten years, I've never had to get mine replaced, so in the past six years you can only imagine the shit that has come into contact with that card, rendering it very far from sterile.