Remove oven racks, trays, and loose debris
Mix water with a small amount of vinegar in an oven-safe bowl or tray
Place the bowl or tray on the middle rack
Set the oven to a low temperature, around 250°F to 300°F
Heat the oven for 20 to 30 minutes to create steam
Turn off the oven and let it cool slightly
Open the oven door carefully
Wipe the interior surfaces with a damp microfiber cloth or sponge
Use a soft brush or non-scratch pad for stubborn spots
Repeat the steam process if needed
Dry the oven interior with a clean cloth
Reinstall the racks and trays after cleaning and drying