The usual drills. Light swirls, Meguiars #9 or 3M SMR. I believe 4star precleaner will remove all the fillers from the polish so you should be safe there. If you are not using the precleaner then just give it a good wash. I won't even bother with Dawn, because base on my last experience with their Shampoo, it did a very good job removing all the fillers from DACP.
"If Any"? and "paint is in really good shape?" If you can't really see the swirls, you might want to just forget about the polishing step for now and go ahead and apply UPP and let it fill in these light swirls.