This might sound like a Meguiar's ad, but there isn't much better where I'm at. Anyway, my Mitsubishi Magna done with Meguiar's Clay, Scratch X, Polish and NXT Wax, then got rid of the streaks with Quik Detailer. Managed to get rid of some swirl marks left by the drive-in car wash. The NXT is pretty good, but expensive here (AU$42 which is about US$30). I'll have to remember to put a really thin coat of it next time round so I don't get streaking. Scratch X is good for removing swirl marks but a pain to apply by hand.