Use a quality sealant instead of flimsy carnauba wax.
I have a MR teg, and it was pink when I bought it. After using the klasse twins (AIO and SG) it hasn't been pink since.
An acrylic polymer sealant will protect the paint from harsh ellements like UV light, industrial fallout, etc, all the contribute to the fading and oxidation of MR.
Klasse AIO will remove the oxidation, and SG will protect it from happening again.
If you would like to know more about these products just ask, I could write a book about them.
Good polymer sealants -> Blackfire, Zaino, Platinum, Klasse, Meguiars #20