I use brushes on my tires and carpet sometimes (I have rubber floormats throughout so hardly have to use anything on them). For the body only the Edge Shmitt now, I looked at those boars hair brushes and still not sure about washing with those lol, my cousins hunts wild boars and they sure as heck don't have soft bristles, quite prickly....and their attached to a pig with a serious attitude, scared the hell out of me lol.
The other day I washed one of the cars and kinda cringed when I saw my neighbor washing his C6 vert with some big mop thing that looked like one of those large floor duster/cleaner things that people use in stores to clean (aisles etc). Luckily the other neighbor with the C6 Z takes care of his car lol.