But what if they serve onions and you use your fork and knife that were in the dishwasher?
I asked my people. One of them pointed to ??? ????? 447:134 http://hebrewbooks.org/pdfpager.aspx?req=14169&st=&pgnum=52
He is quoting from ?”? that if a food absorbs issur which is pagum, and then the food becomes ????, it does not reinvigorate the issur.
Perhaps the same applies here, even though it is a bit different.