Biohazard
Those unpainted sheet metal panels are going to the sandblaster to get completely de-gunk'd. Hey, why not? I'm taking some other stuff so may as well toss it all in a box. The black outer part of the HVAC box got sprayed down with ammonia to make sure it is completely de-con'd.
I did get the manifold heat valve unstuck so now both manifolds are going to get sandblasted so there's no accumulated carbon on the insides.