Meat and Milk — Soaking in a Porcelain Vessel

A cold piece of chicken fell into a porcelain plate that contained cold milk. It was left that way (with the chicken in the milk) for more than 24 hours (the quantity of milk was not sixty times the chicken). Can the plate be kashered by filling it with water for three days, according to what is explained in Orach Chayim 451:21? Seemingly, according to what is explained in the Mishnah Berurah there, s.k. 118, based on the Shach, that this method of kashering is not effective for other prohibitions, one should be stringent in this case, since meat and milk together were absorbed, making it a case of issura bala — it absorbed a prohibited substance. However, it requires examination whether the Mishnah Berurah is stringent even regarding porcelain vessels, or only regarding earthenware vessels, because although the Mishnah Berurah (at the end of siman 451) was stringent with porcelain and treated it as earthenware, nevertheless this is not agreed upon; and the Kenesset HaGedolah, who is the source for the Mishnah Berurah there, was lenient regarding other prohibitions. And although many are stringent regarding the main issue of porcelain, nevertheless here it absorbed while cold, and it depends on the uncertainty in the Shach [for what the Mishnah Berurah cited there in the name of the Shach depends on the two answers of the Shach], and this requires examination. This is especially so since in Chikrei Lev (Yoreh De'ah, siman 78) he wrote that the Rishonim disagree as to whether kashering by filling with water is effective for other prohibitions, and that the majority prohibit it; nevertheless, he concluded that one may permit it if it was soaked in a liquid that is not sharp, in combination with the opinions that utensils do not absorb through soaking except a minute amount, which is nullified in ordinary prohibitions that are not forbidden in even the smallest amount, and in combination with the opinions that soaking has halachic effect only with sharp substances.
With thanks and blessings, Yaakov Shimshon Shapira

Greetings and blessings. 

It has become prohibited, and filling and pouring out does not help for it. 

Filling and pouring out is not effective for all prohibitions. The status of porcelain is like that of earthenware. In practice, halachically, soaking prohibits in any liquid. 

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