Hi ♫
He must to go see a Psychoanalyst ( not a psychologist, nor a psychiatrist**). By letting him to talk like he wants to, he / her will help him to find WHY he has ocd. Then that could be cured. Ocd is only the symptom that ' something ' that is unconscious happens in his psyche. That can be a neurosis / an important subconscious conflict / anxiety. etc... . Unless it's these 3 things at the same time.
As soon as we find the cause(s), the symptom(s) / ocd or other disappears.
Don't think Psychoanalysts are expensive, most of them adapt their prices in accordance with the income / money of people. Don't hesitate to find another, if the one you found doesn't do it..
Have a nice day
Catherine
** Psychologists and psychiatrists are not adapted for treat this problem, because they don't go in the subconscious of people for ' catch ' and understand the cause(s).