you can clean it, but it wont matter because if you say after the car warms up its fine, then its not your throttle body, however it has to be your ICV because the ICV isnt really used when the car is warm, and what i meant by that is after you put the ICV valve in, 2 days later from the bumps on the road it might have changed its position a little bit because when it is sideways it does have a dramatic effect on the idle