I was once told by the then-manager of the A-E Cabazon outlet that white shoe polishes were "snake oil." Neutral was the way to go on non-suede white leather. I have a couple of pairs of A-E spectators/lawn bluchers with such leather and have always used Kiwi neutral on the white surfaces.

For my white bucks and my good A-E spectators with white suede, I use Hollywood Sani-White to cover up dark smudges that my suede eraser cannot get out entirely.