Earl Grey Tea

Bay, clove, and cinnamon are all ruled by the sun as well as Mars. They are fiery herbs of protection and therefore are suited to protect vehicles run by engines. Bergamot, the main ingredient in Earl Grey tea, is ruled by the moon and is used to protect from sudden movement, e.g., your car being hit, towed, or jacked. Prepare a plastic zipper-lock bag chock full of bay leaves, cloves, cinnamon sticks, and Earl Grey tea. (Please empty the tea out of the tea bag and into the zipper bag, or use loose tea.) Place this bag in the glove compartment, trunk, or under the seat. Make sure it is hidden from plain sight. Often magic is not supposed to be shown out in the open. Many witches believe this takes power away from the spell. In the case of protecting a car, it is wise to hide the magic, as it will also affect the aura of the car and make it somewhat invisible or unlikely to attract attention.

This comes from The Supermarket Sorceress's Enchanted Evenings by Lexa Rosean