The World Federation One Stop Fiqh

Ruling 292

If a person doubts whether or not something is stuck to a part of the body on which wuḍūʾ is performed, in the event that his deeming this probable would be considered by people to be reasonable – for example, after working with clay, one doubts whether or not clay is stuck to his hands – he must examine that part or rub his hands to the extent that he becomes confident that if there was something stuck on them, it has been removed or water has gone underneath it.