Meguiars Dual Action Cleaner Polish is one of the best products for removing oxidation. Needs to be used by a buffer. Very consistent results.
Even with oxidation removed, I've found in my struggle to get something great on that minimizes oxidation that any liquid will cause color to come up. That's why I shifted to Blackfire this fall. To have the sealant last longer.
But I have also found out that Paste Waxes don't bring up color. I've used P21S, 3M Perfect-It Paste, and Meguiars #26 Hard Yellow Wax. This leads me to believe that these paste waxes are actually the mildest.
I'm topping Blackfire with a Carnauba to see if that helps. It sure looks great that way. I'm sure it would have similar results with Klasse All In One.