Why not take the UIM off, take it to the car wash and spray the sh*t out of it. I purchased an extra UIM a while back and did this, and it seemed to work great...everything came loose and it looked great...I never installed it due to a mod gone bad, but am looking to clean the UIM on my car this weekend...I have searched, but have not seen/heard of anyone doing it, and the reasons to or not to do it...thankx
~Matt