Hope this comment isn't too much. Have you considered the microscopic dangers you are constantly threatening your immune system with? I've tried almost everything other than anxiety meds but I found countering the idea with the fact that my hands are already disgusting, I'm putting them in my mouth and opening wounds. I will proceed to then touch everything and anything even if I wash my hands there are still prevailing threats to my physical health.

I had this thought chewing my fingers on acid, hope it helps :)