I know if they are very cloudy, it's a fine sand and polish to get a near perfect look. But unless you lacquer it, they will become cloudy rather soon. I have used the 3M headlight system, which is just progressive sanding and a finishing polish. But have used plain wet and dry and had as good a result. If they are not too bad yes Something like Renovo rear screen polish would do as would a fine cutting paste. You can find a host of solutions on YouTube some good advice, some complete fantasy.