I have burned on foil on bottom of oven, how do I

Actually you can remove the foil but it will take patience and several hours. This is what I recommend. BE CAREFUL, remove as much of the foil as possible then turn oven on to 200 degrees. Lay an old wet bath towel on top and use a plastic spatula to remove the foil. Be patient, keep the towel wet and expect this proceedure to take several hours. Do not leave the oven on and go to bed.

it will not remove it is cooked into the coating now, it happens to alot of people try not to put foil on bottom of oven