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Thanks to a tip from someone years ago, I use Meguiar's interior protectant (like Armor All) to lubricate stuck windows. It doesn't leave the gunky residue that WD-40 ultimately will, wipes easily off the glass, and works very well. I treat all the windows of all my cars once a year or so. The '84 LeBaron I recently bought arrived with a rear power window stuck down. I figured I'd have to replace the motor or regulator but it worked fine with a squirt of Meguiar's. Similarly, the power windows on an old Mercedes I bought a year ago were very slow but speeded right up once squirted.