I'm not a CAW builder, so I can't help so much there.
What I do know is where store content is put in your Sims 3 folder, so...
dcCache folder... YES! You can simply move that folder out like you do with your Mods. ALL your store content is installed there. It also goes into the InstalledWorlds folder and of course the WorldCaches folder. Your library files include any venues as well.
All folders can be moved out and replaced later.
BUT... you can simply rename the sims 3 folder and launch the game to have a brand new sims 3 folder minus anything you have added to it.
That's what I do all the time.