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We know that in general before kashering a utensil one must make sure that it is an aino ben yomo. This is because otherwise the utensil will reabsorb the ta’am issur that it expelled. Because we say Chanan by sha’ar issurim even lach b’lach (unless there is a hefsed mirubah) all the kashering water will become assur and will reenter the pot. http://www.oukosher.org/index.php/common/article/lo_basi_ella_lorer1/