I follow some of the instructions and a few videos found in the link below:
To clean the cluster I took took the lens off the cluster by unscrewing about 8-10 small torx screws from behind the cluster, and the lens basicly snaps off the cluster. What I found after doing this was that the spills was actually on the outside of the lens. I know pretty stupid, but the spill was so etched into the plastic is was hard to tell.
Now knowing where to actually clean, I started with windows cleaner and then rubbing alcohol, but was not making any progress. I had some heavy duty glass cleaner so I figured I would give it a try:
I started in a small area with this stuff as it was pretty powerful. I quickly discovered this stuff worked just like it does on glass. One tip I would offer is to wear gloves, and also use either a foam pad or microfiber towel to start your polishing. After about 15 mins of polishing, 99% of the spill was finally removed.
I then went over the cluster with a fine swirl remover polish to removal any swirls this glass cleaner may have introduced. I only spent about 5 mins on this as this plastic lens is pretty soft, so didn't want to completely remove layers of plastic. I finished the polishing up with some more rubbing alcohol to clean down the surface once more and prep it for my next step.
My last step was to apply a layer of paint sealant to offer some UV protection so the plastic would not yellow like some plastic headlights do. Not to mention this would help hide any remaining swirl marks. I did a few coats of this stuff as I had it in the garage:
And as you can see below, this turned out pretty good.