The whole Megs DACP/3M products always seem to get mixed up.
The DACP is a cleaner AND polish and has more cutting power than a glaze, such as 3M PIII-MG.
You would, if the finish is in not so great condition (swirls and somewhat dull) use DACP first with a cutting pad.
Then, follow with 3M PIII-MG or Megs #9 or SWP and last #7 or 3M PIII-MG then 3M PIII-FG both very good prior to your wax. The #7 is a bit on the oily side, but that's fine for carnuba wax application.
I always have DACP on hand. I test one area with the 3M PII-MG and if not removing swirls enough, then I go to the DACP, then back to 3M PIII-MG.
I just assisted with a couple doing their Porsche Boxter in bad shape, and all he had was the MG. I gave him my DACP and a new cutting finger pad, instructed him to make sure it breaks down fully, wipe off, then follow with the 3M. Came out very nice, although it has many bird dropping stains that will require spot compounding, they went to Zaino after all polishing and removing oils.
It looks 100% better, and they were very grateful.
Get both DACP and 3M PIII-MG for your chemical assortment, I'm sure you'll use them!
Regards,
Deanski