Make a decision
Whole-house duct package versus targeted branch
One scope
A whole-system scope should list trunks, branches, returns, registers and equipment protection.
The other scope
A targeted scope may address one branch with known construction debris or pest contamination.
A concrete example
A covered renovation outlet may be clean while an uncovered register trapped sawdust. Inspect the affected branch before paying to vacuum every run in the house.
Which question settles it?
Evidence should determine extent; one dirty grille does not justify the same work in every branch.