<< I'd probably just RMA the cartridge.
You can try to clean the roller in the cartridge with alcohol or something, but you might end up doing more harm than good. >>
-----STOP!!!! You will completely ruin the drum with alcohol. Don't ever use ANY alcohol on the drum of any printer/copier (selenium excluded).
Hey you goofed it up, you should try to fix it if you can. (If you are honest you will do what's right.)
This is what you do.
If you can see the spot on the drum (separate the drum from its toner cartridge if you can't) then get a soft, clean cotton tee-shirt that you don't need anymore and that doesn't have any screen printing (it must be clean and without any rough areas on it.) Using the shirt, softly rub off all the grease from the spot on the drum. Repeat the process a few times with clean areas on the tee-shirt, or until the greasy spot on the drum appears dry. Then find some Q-tips with cotton heads and softly, gently rub all over the areas previously cleaned off with the tee-shirt. (Gently: a bit more pressure than you would need to squash a small spider, or about the same pressure than the weight of your mouse and ball exerts on a mouse pad.)
After you have done the above and the area is all cleaned on the drum, follow the next instructions. Next, using other clean areas on the tee shirt, slightly dampen a spot on tee shirt (slightly: about 4-6 drops of water on the tee shirt). Let the water diffuse throughout the tee shirt surrounding areas and squeeze the shirt together to dissipate the water. (Water desensitizes the drum also, but not nearly as significantly as alcohol, which actually destroys the organic surface.) Then use the damp area to go back over the area that you previously cleaned. The objective here is to get the remainder of the grease (that you can't see) off the drum. Then go back to the previous paragraph and repeat this process with other dry, clean areas on the shirt and Q-tips to dry the drum. (All with light pressure whenever touching the drum with cotton or any substance.) NEVER touch the drum surface with any part of your hand at any time. Only touch the black plastic gears, chassis, or other parts, NEVER the colored drum surface with your hands or arms or any skin (skin oils produce the same effects.)
Now when you print, it should take anywhere from 1/2 to 2 dozen prints before the drum prints ok.
WARNING: All of this must be gentle and completed while hiding under your bed or in the closet. :\
JK, but you do need to do this is a dimmly lit area, since this will take a some time to do very gently. (Treat the drum gently like you should treat the optical lense on a camera to prevent scratching.) Where-ever you do this, don't do it near any daylight or bright flourescent and UV light, this will decrease the life of your drum, because the cartridges have an ORGANIC electrostatic, light sensitive surface.