I have read several articles stating that one may double wrap food and place it into a non-kosher oven.
I haven't read anything regarding the "opposite situation". Lets say one has verified that an oven owned by a non-Jew had all non-kosher food double-wrapped. Can a Jew place kosher food that is unwrapped into that oven?
It seems to me that this would be OK, but are there any other possible concerns, here?