Dryer sheets can be used for a number of things, from descaling a kettle to cleaning your car.
Add some washing up liquid to the pan in question and then add enough water to cover the burnt part of the pan.
Put a dryer sheet in the water and push it to the bottom of the pan so it is submerged.
Let it soak in the soapy water for at least an hour, and then throw it away.
Wash the pan and scrub away any burnt remains with a scourer.