Make a decision
Odour source versus deodorizing treatment
One scope
Finding a source may involve moisture, electrical heat, pests, combustion or ordinary seasonal dust.
The other scope
A deodorizer masks or changes a smell without establishing its cause.
A concrete example
A musty smell after a coil drain backs up requires moisture correction. Fragrance may make the cabinet smell better without clearing the drain.
Which question settles it?
Persistent burning or fuel smells call for safety action and diagnosis, not fragrance.