For a few dollars, pick up a couple of dish drying mats at your grocery store (I get mine for $3.00 in the kitchen supply aisle) and keep them in the car or in a kitchen drawer. They make super absorbent seat protectors. We use them in the car after a day at the pool to prevent wet suits from soaking the car seats. You can also throw one down to protect upholstered dining chairs from toddler spills. In a pinch, they’re great to pack in the diaper bag to use as a changing pad too – they wash and dry easily and fold down to a portable size.