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Summary: When cleaning a leather car seat, use a citrus-based cleaner to remove some of the oils, dirt and grime, and follow this by using an oil-based lubricant for protection. Discover the supplies needed to clean a car's leather seats with help from the owner of a car detailing business in this free video on auto detailing.
"Hi, my name is Tim Duke with Premier Detailing. We're located here in Orem, Utah and I'm going to show you how to clean a leather seat. What we use is a citrus-based cleaner, it's a leather cleaner, what it does it remove some of the oils and all of the grime and dirt that's in the cracks. You just want to spray it on real nice, make sure you've got a nice good coating of it and then I've got a nylon brush here, the same sort of brush I've been using on almost all my details. And you just kind of work in a circular motion applying a little bit of pressure to help move the seat around and get in between the cracks. And as you just work your way through you'll see it starting to lighten up, apply a little bit of pressure, get in the cracks, circular motion. And then wipe over it with a nice clean white towel when you're done, a cotton terry. And then when you're done with that, you have a little bit of residue you remove from the seat. These were already pretty clean seats. What you're going to want to do after you're done getting rid - cleaning the seat, degreasing is put a nice oil and oil-based lubricant on it with a UV protection usually, a leather conditioner because what's that's going to do is you've just removed all the oils while you were cleaning from the leather seat and you don't want it to dry out, and so you're going to need to put a conditioner back on there, which will moisten it up, make sure things won't crack, keep the life of your seats a long time."
eHow Article: How to Clean Spots on a Leather Car Seat