143 Avodah Zarah 4/5-8

(5) How does one nullify [an idol]? If he cut off the tip of its ear, the tip of its nose, the tip of a finger, or if he dented it even though he did not diminish it, he has nullified it. If he spat before it, urinated before it, dragged it, or threw excrement at it, it is not nullified. If he sold it or used it as collateral, Rebbi says: He has nullified it. But the sages say: He has not nullified it.

(6) An idol whose worshipers abandoned it during peaceful becomes permitted [for benefit]; if during war times, it is prohibited. Royal pillars [upon which idols would be placed] are permitted, because they are erected [only for] when the king is passing by.

(7) They asked the elders of Rome: If [Hashem] does not desire idolatry, why does He not destroy it[s objects]. They said to them: If only they were worshiping things which the world does not need, He would destroy them; but they worship the sun and the moon and the stars and the constellations--should the whole world be destroyed on account of the fools? They said to them: If so, let Him destroy those [idols] that the world does not need, and leave the ones that the world does need? They said to them: Then we would even be strengthening the faith of their worshipers, for they would say, "This is the proof they are gods for they were not destroyed."

(8) One may buy a stepped on wine press from a non-Jew even though he takes [the crushed grapes from there] with his hand and places them in the pile. It does not become libation wine until it drains to the pit. Once it has drained to the pit, [if the non-Jew touched it,] what is in the pit is prohibited and the rest is permitted.