Yosef Karo

“ Nonetheless it is forbidden to say to an idol worshipper “cook vegetables for me in your vessel,” and similarly one also cannot say to him, “make me a brew,” for any one who says “cook for me,” he is like one who actually cooked with his own hands, and it is possible that [if it was made by] druggists it is permitted, because all specialized craftsmen set aside clean dishes for their work so that their craft won’t be damaged. ”

“ Seif 4 A pot that has absorbed meat and milk: if before a night has passed they heated water in it, it's counted as if he's again cooked the issur. So we count 24 hours from the time water was heated. ”

“ Rema: But anyhow if there's 60 parts versus what's stuck to the pot it's all permitted, since what's in the pot is already blemished and needs no nullifying (such is implied above, #95) . Some say with sharp tasting foods the rule of noten taam lifgam doesn't apply, as explained above in #95-96. ”