 Why might the narrator feel that he is "so dirty, so very dirty that I could never get clean if I bathed every hour for the rest of my life"?
All my great-grandfathers have it. They told everything I needed to know to become the most powerful man in the Solar Federation. I remembered that he was somebody very important whose name and work I had once known, even if now I knew him only as Doc. I don't know why, but nobody will help you if they think you are blotto. They have a little caffeine in them—not enough, never enough, but better than nothing. I was so dirty, so very dirty that I could never get clean if I bathed every hour for the rest of my life. Everybody has a name, and I knew if I went off somewhere quiet and thought about it, mine would come to me.
 Because he unknowingly feels debasement in desiring something material.
 Because he is homeless and unclean.  Because he has cooties.  Because his addiction prevents him from bathing.  Because he unknowingly feels debasement in desiring something material.