Olmechtec,
The Throttle actuator has little exposure to the fuel stream. Imagine looking into a throat of a carburetor with only the butterfly valve and no fuel jets. A fuel cleaner would have little if any effect on this unit. The ETA is mostly sealed consisting of switches, pots and a drive motor.
Anziani

The 3M cleaner has three cleaners. Two for the throttle body, and one for the fuel system. You can check out the video below:

Amazon.com: 3M 08963 Fuel System Tune-Up Kit: Automotive

This worked wonders solving bad idle issues on my 300E, and improving gas mileage. I'm only out $39 after doing this.

If cleaning it does not work, I would try swaping in a used ETA to see if that solves problem. Almost all the "Solved" ASR issues I've seen were caused by ETA idle issues.

You know what PT Barnum once said . . . . :(

If you feel that you MUST do this, get a can of "carb" cleaner and Lucas "Seafoam" and save yourself $40 dollars or more.

Point taken.

Clean first, then replace if necessary. Maybey you get lucky.