I love the Green Lantern Car Wash. It is the type of car wash where your car is on a track and is moved through the wash. The prices are reasonable (about $5 for the basic wash) and the service is great too. They put covers over your rear wipers and do a hand rinse before going through. They also often give you a little bag with coupons and deals. It's pretty easy to access--just east of Home Depot near I-35 and 152. Whenever I'm in Liberty with a dirty car, I stop here!