Commentary for Avodah Zarah 151:11

The Talmud explains that it is not necessary to kasher the vessel by making it white hot in the following circumstance. He cooks hatat today and then, on the same day, he also cooks a shelamim. This will get rid of the taste of the hatat. He then can cook in it hatat tomorrow, and then the taste of that hatat and yesterday’s shelamim will become remnant at the same time, the next day. Then he again cooks in it shelamim on that same day, thereby purging it of the taste of that day’s hatat. As long as one keeps repeating this process, kashering will not be necessary.