The peeling part will be your creosote buildup.
A plastic windshield scraper will remove what needs to be removed.
A little windex and a rag should cleanup around the vent hole.
I don't think they recommend much water hosing of the interior,especially around the heat element and temp probe.
You can run the side racks and cooking racks through the dishwasher.
I used to use the smokette about like a commercial cooker.
Annually,I'd take it out in the yard and scrape the heavy buildup from the walls.
Spray the inside with Greased Lightning or Simple Green and let set a few minutes.
Hose it out and wipe out with paper towels.
Go over the hinges,latch,etc with light machine oil.
If it is the black paint,I might do a little touchup where needed.
This removes some of the seasoning from the interior,but it is back after a couple of cooks.
Hope this helps a little.