Find the cause before masking the smell. A deodoriser can make it harder to distinguish spilled food from a damaged fitting or an appliance-related odour.
What the observation tells you
Check accessible containers, dates and permitted removable parts first. Fragranced products may also affect stored food or leave residue if they are not intended for that use. Burning smells, smoke or electrical damage require a safety response rather than a cleaning experiment.
A useful next step
Use the manufacturer's recommended food-area cleaning method, keeping chemicals away from openings and electrical parts. If the source remains unclear, note when the smell appears and whether cooling has changed. Do not keep running an appliance with signs of overheating.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.