Some people, when they finish eating and have pieces of squeezed lemon, take them and wipe their hands with them

Question:
May Allah reward you, Honorable Shaykh. This questioner says: There is a phenomenon among some people where, when they finish eating and have pieces of squeezed lemon, they take them and wipe their hands with them to clean off the food and grease. Is this permissible?

Answer:
There is nothing wrong with that, because this squeezed lemon has become worthless. There is no objection to using it to clean your hand, because it is discarded and has become worthless. However, if it is still clean and in its original condition, it is not permissible for you to use it to clean your hand, because they may need it. They need it and use it. But if it was squeezed previously and nothing remains in it but traces, it has no ruling and no consideration. There is no objection to using it to purify your hand. Yes.