It is narrated from Hazrat Maymunah that once someone asked the Prophet (peace be upon him) about the ruling if a mouse falls into ghee and dies. The Prophet (peace be upon him) said: If the ghee is solid, then remove the part (where the mouse fell) and the ghee around it, and then use the remaining ghee.
Hadith Referenceمسند احمد / مسند النساء / 26803
Hadith Gradingحکم دارالسلام:حديث صحيح، م: 5538، محمد بن مصعب مقارب الحديث فى الأوزاعي، وقد توبع