Nope! Nothing changes! I'm in the same situation and I'm leaving! I can't live like that. How disgusting, you must be beside yourself 

I'm a clean person and I keep a clean and maintained home. I raised two kids who knew better than to leave their rooms like pig pens. They'd have been sleeping on the couch while their room "stayed clean." I'd break and have a meltdown. Someone would start enforcing cleanliness with his kid(s) or someone would be packing all their stuff with said kid(s). Smells coming from the room?? I could not live like that. I'm sorry you have to deal with this problem.

When he comes home from work. He should go into SS room and make sure it's clean or make him clean it ASAP. 
If he inspects the room daily. It's will not get that way.  DH is the parent he needs to do this. That parenting.  SS has showed he needs this type of supervision 

My advice is: wait til the kid is at BM's. Deep clean his room and recover all your dishes. Rent a steam cleaner and clean the carpet. Wipe down the walls with bleach. Get him a trash can with a food pedal and a lid that auto-closes. Hide air fresheners all around his room (sew them into the curtains, etc. ) 

Then Dexter Morgan that room. I mean cover EVERY floor, wall, and ceiling in sheets of plastic. Hang flypaper from the ceiling. Put a biohazard bin in the corner. He gets a plastic anti-pee cover on the mattress and disposable (cheap sheets that can be thrown away when he leaves, because you arent' washing them. ) Now this kid can't harm your home, and you can close the door when his smell gets too bad. If he expresses surprise at the level of containment you have implemented, just tell him his disgusting ways have created unhealthy living conditions for him and your family, so this is what needs to happen if he is going to continue living like a pig in pigsty.

Then: snap a picture of his face when he sees it, so you can laugh your ass off for months to come. 

OK, read my past blogs. OSD's room was JUST as bad. I could smell it from the hallway with the door closed. That was my limit (after multiple suggestions and request to DH that it be cleaned).

So I gave both DH and OSD three warnings over the course of a month:  "Please make sure the room is cleaned fully by "X Date." If it's not cleaned properly (that's the key - OSD would simply shove everything, moldy and all, into the closet and drawers and do no laundry instead of actually cleaning) by then, I will do it and you may not like it."

I gave DH one final warning before that weekend. It remained. So I removed 6 (SIx!) trash bags from her room - literally everything not in a reasonable place was bagged - I had to go through the closet, drawers, underneath furniture to find everything; moldy food and mugs, broken things, dirty tissues all over the floor in heaps, makeup all over the floor, moldy towels, sheets not washed for months and months and gray. It was disgusting.

I did this two times. DH allowed her the first time to use the bags in the garage as her storage unit - she woud just go get things as she needed them and there was zero accounability (she was supposed to sort through them for trash/keep but nooooooo that was too hard). I eventually just took them to the dump. The second time DH was mad at ME. Oh, really - so we have rats, mice and ants in the area and you are OK with her room being a beacon for them?  By this point her carpet was done, so I told him yet again, fine, I'll leave it again, but smells in the hallway yet again will result in a full clean out. And if we get any vermin - You, DH and only you, will be responsible for pest control and payment.

She eventually PASd out after this, and when DH and I cleaned out her room for the final time - he was disgusted. And it wasn't even as bad as before. Yeah, becuase I was lying before, right DH?

Anyway, smells in the house, filth vs. mess (there is a difference!!! point this out...messy is OK, filth is NOT OK), vermin, destruction of household items is an automatic NO.

Part of that process is daily inspections at the Squad level, periodically at the platoon and company level, and weekly at the Corps level.  The big one is AFI (Annual Formal or Federal Inspection) which  is the full meal deal inspection of the entire school, grounds, facilities, rooms, uniforms, weapons, etc.... 

Paste waxing the common area floors after doing the floors, etc... in your own room with your room mate  is a true lesson in team work and group accountability.

For the nasty pigs who fail to support the success of the unit, blanket parties in the middle of the night get them in line in a hurry.  No nasty rooms tolerated, no stench either body or garbage tolerated, no disorderly uniforms tolerated, no failure to do school work tolerated, no continual acts of nonconformity tolerated, no lies tolerated, no cheating tolerated, tolerance of anyone who fails to comply is nearly zero and the consequences drive escalating misery. Which is why not too many fail to comply.

It worked wonders on our son (my SS),  it worked wonders on me, it worked wonders on my younger brother, and it worked wonders on our dad. These schools are experts at instiling confidence, performance, accountability, and standards even into kids who are near the write off point.

Ugh god I can't even imagine the frustration you are experiencing! I've always had really sensitive sense of smell and strong, unpleasant odors drive me so crazy I can't concentrate on anything else. 

I would sit your DH and SS down and tell them you are seriously hurting because of this. This situation is an urgent matter that needs attentoin immediately. It's so urgent that the Wifi will be shut off until the room is clean. The kid might not know how to clean the type of bio hazard in his room (which is frustrating in and of itself) so I would say DH please teach him and if he won't do it, then it's YOUR responsibility. 

I personally would never be the one to clean that nasty mess. I would tell DH he needs to hire someone to do it, do it himself, or get his kid to do it.