Rashi on Leviticus
יקצע — rogner in old French, SCRAPE OFF, and in Mishnaic Hebrew it occurs many times.
Rashbam on Leviticus
יקציע, peels. Either as in Isaiah 44,13 “with a scraping tool,” or as suggested by the Talmud that the walls will be peeled off to the depth of a handbreadth. (Keylim 27,4).
Siftei Chakhamim
From within. מבית does not mean “from the house,” because it is missing the ה (מהבית). Also, it would not be understandable to say that he should scrape the house from the house.