There is a very precise formula when packing for a long car trip. There is much debate about what should be included, but there is one thing that my car never leaves home without - wet wipes.
I have two packages of wet wipes on hand at all times, one in the glove box and one in the pocket of the back seat. There's also a small pack in my purse. They're good for everything. Kid gets chocolate all over hands and face - wet wipes! Teen spills Dr. Pepper all over the seat - wet wipes! Dog upchucks in the back - wet wipes! Mom has a meltdown on exit 82 - wet wipes!
So I might forget to bring toothbrushes, pajamas, or earplugs on the trip, but I will never forget wet wipes.
What's your never forget car item?

