What is the ruling on increasing the amount of water used for ritual washing (ghusl) and ablution (wudu') in a way that causes a waste of time and effort, and what is the means to get rid of these obsessive thoughts?

Obsessive-compulsive disorder (OCD) is a type of mental illness. Its treatment involves belittling these obsessions and disregarding them, and dealing with them firmly. For example, when performing Wudu' (ablution): do not wash a limb more than three times, and do not pay attention to Satan's whispers that your Wudu' is incorrect. Likewise, do not pay attention to obsessions related to wiping clothes or anything else. Certainty is not removed by doubt, and doubt after an action has no effect and should be ignored if a person is prone to excessive doubts. It is also advisable to consult a trusted psychiatrist.