Making Shoes Tahir by Earth
Question :

If my shoes become najis by stepping into najasah, can I make my shoes tahir by rubbing them on the earth?

Answer :

Earth can only make the soles of the shoes, the feet and the like tahir by walking on them, provided that the najasah was caused by walking on the earth.
Earth can make things tahir when it is dry, and based on an obligatory precaution it must be tahir itself.