CT Brand carb cleaner. I used it on my UIM and TB. Nasty crap that came out of the UIM. the stuff stinks and when mixed from the crud from the UIM will stain the cement, so be carefull.
What I did was spray a bunch inside(it was off the car) and sloshed it around and then dumped it out. Did that a couple of time until the fluid was clearer than when I started.
have fun