The World Federation One Stop Fiqh

Ruling 383

Someone who doubts whether or not he has performed ghusl must perform it. However, if after performing ghusl, when the ghusl would commonly be considered finished, one doubts whether or not part of his head and neck or body has been washed, then in case he habitually performs the acts of ghusl in close succession and knows that he has washed most parts of his body, he must not heed his doubt.