Commentary for Avodah Zarah 69:2
ומדקא"ל מפני שמעמידין אותה בקיבת עגלי עבודת כוכבים וקא מהדר ליה א"כ למה לא אסרוה בהנאה מכלל דעבודת כוכבים אסור פרשייהו
And since R. Joshua responded, “because they curdle it with the rennet of calves sacrificed to idols,” and R. Ishmael replied: “if that is so, why do they not extend the prohibition to any benefit derived from it”— this proves that it is forbidden to derive benefit from dung of animals used for idolatry.
Daf Shevui to Avodah Zarah
R. Ishmael clearly states that it is prohibited to derive benefit from rennet of calves offeredfor idolatry. This proves that the same is true for dung.
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