I wouldn't clean the inside of your cooling unit with the brush. The CU collects resin and this will foul your brush making it sticky.
I use the S&B brush for lots of vape related cleaning chores, and it goes in the alcohol all the time as part of the process. One brush can sometimes last for months. I usually rinse with water after using w/alcohol.
For the bowl a magic eraser can work wonders; I try to find the ones that have no detergents or obvious additives, give them a thorough rinse before use.
@Bomb33 the capsules are really nice. They have not been on the market more than a few months, so if you are skimming this thread you'll find a lot has already been written about them.
Try not to dent or deform them as you open/close, and they will last a long time. Clean when they get sticky with iso soak (and brush!).
Note that the clear cap of the magazine (holder) is also a filling funnel. Have fun with that!
They will not hurt your Mighty casing at all. IF the top of the cap is not 'seated' (closed all the way), it can put pressure on the c/u as you screw it down, so just be sure the tops are on the caps nicely. And don't ever put one in the chamber upside down! They are tapered and it will get wedged in there pretty good...
Most important to keep trying til you get it right!!!!! Then try again just to be sure... then once just 'cause that one went so well, and...