Based on info from a Mustang site years ago, I used Mother's Mag Wheel Polish. If the haze is really bad, WET sanding with 1500 grit sandpaper first, then the polish and then wax, will make them look new again. Our X5 only needed the polish and they look amazing.

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Cheers!
Chris

03 X5
02 Acura
88 Mustang GT Ragtop
88 Campion Allante 195
99 Itasca 29