Hoarding

Does anyone have any suggestions on how to deal with ADHD hoarding? I can't get into my garage, there is a path from the basement steps to the washer and dryer, and there are piles of "stuff" everywhere. I can't reason with him because he is in denial and untreated. If I try to toss anything my ADHD spouse freaks out and starts throwing my belongings out into the garbage or into the backyard. I am drowning in clutter.