Year-round, pans of food and foil-wrapped food are placed on an electric warming tray; the foods within are not kosher for Passover. What's the easiest way to permissibly use the tray for Passover? Can one just use it as is, since the food doesn't touch it directly? If not, can one use it covered with foil? Or what?
I asked this question a couple of years ago to my LOR and was told that I should clean the surface as well as possible (two rounds of EZ OFF will do) and I should then cover the surface with aluminum foil.