Scientifically speaking, is it possible to unlearn a fetish?

I've heard that disgust mechanisms in the brain are associated with moral functions due to overlap in their evolution, and that some sexual rehabilitation exists which utilizes bad smells to 'guide' perception against undesired sexual fetishes - typically what's used is an ammonia based solution resembling the odor of urine and feces...do you think this would still work if the unhealthy and unwelcome trait in question is a scat fetish?