I found this list of Car Cleaning Tips in the Olympic Club newsletter the Northwest Wind
 
Car Cleaning Tips

1. Instead of shelling out all that cash on those pricey car fresheners, just grab any essential oil and place a few drops on a clothespin or sachet in the vent and you have your own little home-made air freshener!

2. If you want to keep your vehicle smelling fresh and free of any allergens, make sure you re-place your in-cabin air filters, as it could accumulate dust, eventually creating foul odors.

3. If you’re trying to achieve that glossy interior finish, some old-fashioned petroleum jelly is here to save the day! Apply some of the jelly to the interior and dashboard of your car and you’ll achieve the same look when using Armor All. The only difference is you’ll be saving some good money! Such a simple but effective little hack!

4. Place a few pieces of charcoal under your seat and it will slowly rid your vehicle of those stub-born smells that you thought couldn’t be eliminated. This home remedy is indeed nature’s little toxin absorber. You’re welcome!

5. In order to completely get rid of all that unwanted dust accumulation sitting in your car’s air vent slats, just search your home for an old paintbrush, toothbrush, or a can of compressed air.

6. If you wish to keep your vehicle’s upholstery speck-less and moisturized, make sure you regularly wipe down your leather seats with a solution of linseed oil and vinegar.

7. Though we all love bringing our pets along with us, their hair can be pretty tough to remove from the cloth upholstery. Fortunately, to remove the hair quickly, all you have to do is lightly spray those seats with water and rub them with a rubber squeegee. No need to worry about bringing along your furry friends anymore!

8. If you have some affected areas in your car from grease or oil, apply cornstarch on the leather and cloth upholstery, let it sit for about ten minutes, and the starch should eventually soak up the stain.

9. Got a little blood or some red wine stains in your car? Don’t freak out just yet because with a little application of some club soda, you can easily remove those stains! Just let it sit for a couple of minutes then sponge it up with a towel. Next time, you probably should just pass up on opening a bottle of wine in the car.

10. Believe it or not, with a little bit of mayonnaise, you can eliminate those hard-to-remove stains from your vehicle. Yes, mayonnaise! All you have to do is let the mayonnaise sit for five to ten minutes before wiping it off with a clean rag. Make sure you wash it off completely before your car starts to smell like mayonnaise!