100% silcone spray...and while you're winterizing...might as well hit the door lock cylinders and all hinges.
These are the 2 products I use for winterizing that helps prevent door lock cylinders from freezing and door gaskets from freezing:
- silcone - (spray on a rag...not a paper towel) and lubricate all gaskets...remember around the hood and tail gate/lift gate
- Tri-Flow - all hinges, door lock cylinders, hood latches & locks (Tri-Flow has TEFLON which helps prevent binding where to surfaces rub against each other)