question #1 Sahih al-Bukhari 156, Book 4, Hadith 22 : What materials are considered appropriate for cleaning oneself after answering the call of nature in Islamic teachings?

The Prophet (ﷺ) went out to answer the call of nature and asked me to bring three stones. I found two
stones and searched for the third but could not find it. So took a dried piece of dung and brought it to
him. He took the two stones and threw away the dung and said, “This is a filthy thing.”