only reason was to use it as a paint cleaner, when i was on the megs seminar they used a paint cleaner before any wax, not to polish but to remove all and any contaminants that the clay may have missed.
as for the red mist ontop of wax, i thought this as well, but a pro valet/ detailer on here was doing it at i think the last big meet in wales, and when i asked, he said you can use it straight after waxing.
Mmm, but any contaminants would have been removed by the polish. Point of claying before polishing I believe was to remove anything which could inflict marring.
Hmm, just, I heard that it could possibly melt waxes if they haven't cured first? Iunno.