Beyond the obvious items like washing, waxing, cleaning out the interior, etc . . .
#1 - Clean up the engine bay. It doesn't matter how many miles the car has on it. If it looks good under the hood, that makes a big impression with your average car shopper. It will give the impression that you took good care of it. They make cheap, easy to use engine de-greasers, and you can just wipe down most of the components so they look presentable
#2 - Make the interior smell good. I use Tuff Stuff to clean the interior and carpets, then let it dry real good with the windows down. A clean interior means nothing if a potential buyer gets in and it smells like smoke, dog, mildew, etc . . .
#3 - Buff out those headlights and tail lights! Nothing gives a worse first impression than brown hazy headlights or dulled up taillights (reference my how-to in the DIY section for a quickie fix)
#4 - Pull off any aftermarket crap you added unless you're selling it cheap to a kid (in which case you might want to add more)
#5 - make sure ALL the lights work, inside and out! That's another turn-off for a potential buyer. Again, if you're not trying to sell it to a kid, replace those blue-white hid's and the smoke tint on the headlights and taillights you couldn't live without for oem lights, or you'll you'll pigeonhole yourself down into a small market
#6 - If it's not a straight-up hooptie, pull a carfax and have it available.
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