I got a GONK Droid from TungHori, which had super glue on it.
On YouTube I looked for ways to remove it and found this one here that actually worked.
With salt and (hot) water you can gently solve super glue from plastic surfaces. It remains mat, but I had to remove a few small scratches at the end. Plus you need a lot of patience.
Before:
Salt & water at work:
After:
It took several repetitions to remove all of the super glue. It also left some scratches.