A/C drain

[LanceSupersad]

Ok, now bear with the crappiness of this pic; it's a picture of a really crappy LCD screen, using my equally crappy phone. I was really hoping the snake camera had a "save" option, but it doesn't. I might re-do this at night so I don't have all this glare, and maybe it'll be a little cooler than 90°F.
Pic of LCD screen

This is a crude CAD cutaway of what my posts are referring to (colours match).

So, "1" and "2" are labelled as you can see; that's the drain and (what I now know as) the glovebox AC port.

In my crappy LCD image, the red circled stuff (or red line, in CAD) is the "outside air" side of the evaporator. Unfortunately I wasn't able to capture it with my phone camera, but it is covered in tiny patches of what appears to be black mold. This is based on what I see with a pretty crappy camera, and it's daytime, so the contrast is extra garbage.

The magenta stuff is what would be the driver's edge of the evaporator, and is lined with what appears to be random balls of fluff (it's like this along the bottom as well); they've seemingly been pressed against the wall, and are going to be an enormous PITA to get out. Especially since they're probably soaked with water. In my case, those are almost positively either a mouse's nest, or the remnants of the mouse massacring the cabin air filter. They're also presumably the main source of my "musty" smell, and when they get soaked with water, are making the airbox nice and humid, helping to encourage whatever to grow on the AC core, and to help the mold to grow on the cabin air filter.

The cyan is the back of the evaporator box; labelled simply for reference.

My original plan was to just block the intake (where the cabin air filter is), and attach my shop vac to the HVAC fan hole, but unless I can somehow block most of the evap core and force those little buggers from the bottom/side, I doubt it'd work. Next option is finding a vacuum hose that is like 1/2-1" diameter and pushing it in there in hopes I pick up the shrapnel @ the bottom (the path from the HVAC fan to the evaporator is probably 1" deep ... as a guess). If that doesn't work, I will probably drill a hole in the side of the box (@ the magenta circle) and then cover it after I clean it out; effectively, this would work out to be the same as the glovebox AC port, but at a crappier angle. Another option is to try and "wash" them out; I hope I don't have to try and do that.