Make a decision
Coil cleaning versus condensate drain clearing
One scope
Coil cleaning addresses deposits on heat-exchange fins with material-safe methods.
The other scope
Drain clearing addresses blocked condensate flow and verifies discharge.
A concrete example
A dusty coil can impede heat transfer while a blocked drain causes overflow. The photograph of one does not prove the other; ask for a separate finding at each location.
Which question settles it?
Water near the furnace may require both checks, but the source of water must be located first.