ABS Sensor Question

I have reasons to believe that i might be having problems with my abs sensor.I have heard that you can clean them. If this is true, can you please explain how to clean them. Also, where are they located at? Any pictures would help.

There was a tech bulletin awhile back for ABS sensors. Call a dealer and see if it applys to your truck. If it doesn't do a search in this forum to find tons of posts on the subject.