Saw an interesting cleaning line at the grocery store, Kash and Karry, called Carbona. They offer an assortment that is designed specifically to remove certain specific stain types. They offer formulas for removing coffee, blood, ink, etc. They had about six varieties some were powder some liquid specific to the stain type.

WD 40 removes oil based stains, pen marks, well. Whatever you use, I would rinse with a hose immediately to dilute any residue.

Goof Off, Goof Off, Goof Off will work, its in a yellow can at the paint department at your local hardware store, lowes, home depot, etc. Use it sparingly.

Best stuff I have ever used on Mildew Stains is MDR Amazon's Stain Away. It's safe to use on anything (Headliners, Vinyl and it won't hurt cotton thread). BoatersWorld sells it. After you get it clean Bio-Kleen has a Amazing Vinyl Cleaner and Amazing Vinyl Armor that out performs anything I've used. www.biokleen.com

Valley Boy

the tire cleaner option at the car wash will work on the seats , then spray the stitching about 1 or 2 inches away on the rinse cycle and the brown stitching will now be a nice white.

I use a soft scrub brush on my all white interior with a 50/50 solution of simple green and H20.

I also use Maguiars Vynly sealer with UV40 built in.