How can I help a germophobe stop this f••••• up behavior?

elegatoVI
I know somebody who is an extreme germophobe. That person goes to counseling for it, as well as for going through grief of losing a family member. It is now officially f•••••• ridiculous. That person takes 35-45 min showers almost every day, brushes teeth at least 5 times a day, and when that person got out of the shower only because I had to yell due to how long it was taking, I found a few minutes later downstairs washing arms in kitchen sink. Washes hands so often and with so much friction that bar soap is being used up too fast and hands are raw and rough. When confronted I am told that I am "being a jerk" and "need to leave alone". It sucks ass, wtf can be done by anybody about this?
How can I help a germophobe stop this f••••• up behavior?
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