Attn psychology/psychiatry/medicine grads

I'm pretty sure there is no "solution". I did what you could have done; looked it up on the interbutts:

Behavioral therapy

The specific technique used in BT/CBT is called exposure and ritual prevention (also known as "exposure and response prevention") or ERP; this involves gradually learning to tolerate the anxiety associated with not performing the ritual behavior. At first, for example, someone might touch something only very mildly "contaminated" (such as a tissue that has been touched by another tissue that has been touched by the end of a toothpick that has touched a book that came from a "contaminated" location, such as a school.) That is the "exposure". The "ritual prevention" is not washing. Another example might be leaving the house and checking the lock only once (exposure) without going back and checking again (ritual prevention). The person fairly quickly habituates to the anxiety-producing situation and discovers that their anxiety level has dropped considerably; they can then progress to touching something more "contaminated" or not checking the lock at all—again, without performing the ritual behavior of washing or checking.

Exposure ritual/response prevention has been demonstrated to be the most effective treatment for OCD. It has generally been accepted that psychotherapy, in combination with psychotropic medication, is more effective than either option alone. However, more recent studies have shown no difference in outcomes for those treated with the combination of medicine and CBT versus CBT alone.[40]

Recently it has been reported simultaneous administration of D-Cycloserin (an antibiotic) substantially improves effectiveness of Exposure and Response prevention

Cognitive behavioral therapy
Exposure and response prevention

And then, of course, you've got all of those drugs and meds that manage most of the aspects.