There are a few things you can do to keep it cleaner and prevent buildup that requires cleaning: (affiliate links below) Use an oven liner to protect the bottom of the oven from spills and splatters. These liners are much easier to clean than the oven itself and can save a lot of time and headache! Be sure to check your oven manual for compliance. Use roasting bags when cooking to protect the oven from spills and splatters as well as contain the vapor of liquids. Check as you cook to catch any overflow or spills before they occur. Clean quickly to reduce buildup. If you do notice a spill clean as soon as it is cool enough to do safely so it doesn't harden and build up.