Hi, as an ADHD adult with an ADHD child my recommendation is to pick the hills you want to die on. My recommendation is to differentiate between hygiene and clutter. With regard to your child’s room, let it be their room. With regard to hygiene set the expectation of basic personal hygiene. By setting the boundary of their room can remain cluttered it relieves a large stress point for your family. As an ADHD person myself I allow myself a couple of small areas of clutter in my life. Also it’s important to know that we have no issue managing clutter, it’s not a big deal to us. As maturity sets in I have found that being tidy is better but retain a couple of outlets for my “clutter is okay” ADHD mindset. My wife is still amazed at how I can easily locate items in my clutter spaces. That’s my recommendation.