To clean any burnt on food, start by making sure all controls are off and the oven and cooktop are cool.
If you're using the self-cleaning cycle on your oven, remove the racks first. Doing this will prevent them from sticking when sliding them in and out.
If they do give you trouble when trying to slide them out of place, try a light coating of vegetable oil on the rack guides.
Remove the broiler pan and any other utensils inside the oven before starting the self-cleaning cycle.
As always, refer to your Use & Care guide for more information.