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Irui can only kasher the outer layer of a kli. Hot water poured against a cold kli is an example of חם לתוך צונן (hot onto cold) of which we say (Pesachim 76a) תתאה גבר ואדמיקר ליה בלע. The bottom surface succeeds in cooling down the water but not before the water succeeds in kashering the topmost layer. A kli rishon has the ability to be boleya and to be polet throughout its entire thickness. Therefore, one cannot kasher a kli that was used as a kli rishon with irui, even if the irui is performed with water that is significantly hotter than the temperature of the non-kosher product. http://www.oukosher.org/index.php/common/article/lo_basi_ella_lorer_extended_irui/