What is the correct way to perform ablution (wudu') and the obligatory ritual bath (ghusl) to overcome the obsessive doubt (waswas) about water not reaching body parts and the difficulty pronouncing letters during prayer?

Waswasah (obsessive whispering) is a serious illness, and its ideal treatment is to ignore it and pay no attention to it. When performing wudu' (ablution), wash your limbs naturally three times, and do not pay attention to the whispers of Satan that the water has not covered the limb. Interlacing the fingers of the hands is done by clasping them together, and for the toes, by inserting the little finger between them. If water reaches between the fingers without interlacing, it is still commendable. When performing ghusl (ritual bath), pour water over your body until you are reasonably certain that it has covered everything, and do not pay attention to the whispers. In prayer, recite naturally and do not repeat anything, no matter how much Satan whispers.