Its not very cleanable, unless you figure out a way to take it apart and get it back together. It can be tested with an analog volt meter. It should range smoothly between about .5v to 5.0v. Key on Engine off. (KOEO) . I have never heard of one being cleaned, they are replaced if they test bad. I got an auto parts store to test mine for me. It can be tested off the car with an ohm meter. You just backprobe the BLK and the Green wires and move the throttle through its range slowly. My Haynes manual says that its beyond the scope of the home mechanic to adjust it, and doesnt tell you how. I recommend the Probst book and a good digital/analog volt ohm meter if you are to going to service your own car all the time, makes life easier and saves $.
I was wondering if you had the codes pulled? What codes did you get? Is this why you suspect the TPS? Thats what it is, throttle position sensor. It tells the puter how much you are stepping on the gas pedal, then the puter gives it more gas.