How can I help my mother who believes she is constantly dirty?
In my experience, older adults can develop these kind of disordered thoughts, especially if they have dementia. If you know that your mother's thoughts of being dirty are obsessive, and they are interfering with her daily life, then she needs to be evaluated by her health care professional to see what is going on. Many medical conditions can contribute to disordered thoughts. If no medical cause is found, then she may then need to see a psychiatrist for a full evaluation. I know that sounds worrisome, but these thoughts can be the sign of something going on. Your best bet is to get it checked out.