Question for the ADHD folks about mess

If there are any people on this forum who have ADHD and would be willing to answer a question, I just asked it on another thread but I thought I would open it up.

One of the biggest problems I had with my ADHD husband -- and they spanned the gamut of the symptoms and issues -- was his mess. In the end I think it is the thing that just drove me over the edge. Because we live and work together, it was a daily thing. All day. In the end, his RSD also made it nearly impossible to deal with it as he would rage at me if he felt criticized or if I was at all irritated.

He would, very rarely, cop to the problem. He'd say he was always like this. And apparently he always was according to his family.

In the end it simply seemed impossible for him to change, or to maintain any effort to change. There have been attempts. Maybe there was even something like a 15% improvement. But overall, he remained a force of chaos in the house that I had to deal with, and it just wore away at me. Particularly because a lot of it was small messes that he could easily clean up. EASILY. That's what I say, anyway, but apparently it was not easy for him!

So, I just can't understand this. I would like to understand it better. I can't talk about it with him. So I would like to ask others who have this issue to maybe cast some light on the inner experience of someone who does not clean up, who can't organize themselves, who has a lot of clutter, who makes constant chaotic mess, and who is being asked by their partner to PLEASE do better. What is going on? Why don't you, won't you, can't you, change the pattern? Be more mindful? Remember that someone has asked you 10,000 times not to do something, or to do it, and you love this person? 

Do you just not even think about it in the moment?

I really want to understand more.