Interior
Regardless of whether your vehicle's seats are leather or cloth, the number one enemy of the interior is the sun's ultraviolet rays. And of course a certain amount of spills, marks and grime are unavoidable.
Window tinting helps minimize the damaging effects of the sun (fading of cloth, drying of leather and vinyl), as will an inexpensive windshield sunshade used anytime the sun is out-regardless of the season. And for extra protection, apply Toyota Vinyl & Leather Protectant at regular intervals. For carpet and upholstery stains-including crayon, oil, grease, lipstick, etc.-there's Toyota Fabric Spot Remover.