I figured the Meguire's stuff is too mild to get rid of the cloudiness at once. I'll either keep using it and slowly but surely get them clear or I'll pick up some compound. I also found that using the Mothers foam drill attachment works faster than by hand. It's messier. I splattered the stuff all over the engine bay and bottom of the hood.
I've never heard of using wax on plastic before. I'll take your word for it.