Foggy instrument cluster lens

I recently took apart my instrument cluster, cleaned everything up, re-painted the needles, etc... What I realized when I went to put it back together is that the clear plastic cover is all foggy. It looks like someone tried to clean it with something that reacted with the plastic. What is the best way to restore this clear plastic cover? It seems a shame to hide nice new instruments under a foggy lens.

Any guidance would be appreciated.

-- Gag