Here’s a fun approach to coupon car-vertising put together on behalf of XXL Carwash. Normally when people plaster advertisements on my car I’m not too happy about it. But in the case of this ad, I think I can make an exception. This “50% Off” coupon looks just like the instructional washing labels sewn into most clothing. I never have tried to iron, bleach, or tumble dry a vehicle, but thanks to XXL for the friendly reminder.