This well-crafted article appears on the Psychology Today website. It’s long, but the info is solid. You’ll find a link toward the end that will take you to the research/educational site mentioned in the article. There, you’ll find free access to the treatment manual, worksheets, and supporting materials. If you are having trouble getting help for OCD, here’s a good place to start.
Doubt Therapy Changes Thinking Patterns in People with OCD: German researchers develop doubt therapy as a new form of help for people with OCD. While many struggle with side-effects from medication or difficulty locating a qualified OCD therapist, a no cost doubt therapy manual helps people with washing compulsions.