The deposit matters
Creosote is a flammable byproduct of burning wood. Deposits range from loose soot to hard, glazed buildup. A chimney professional should look at the condition and choose a suitable way to remove it.
The Chimney Safety Institute of America explains that some deposits need more than ordinary brushing. Chemical cleaning products are not a substitute for a professional inspection and sweep.
Ask what the description means
If your report uses a term like stage, level or glaze, ask the technician what it means for your chimney. Ask for photos, where the deposit is, and a clear description of the proposed work. A label on its own is not a complete quote.
Separate cleaning from repairs
Ask which charges are for removing deposits, which are for inspection and which are for repairs. Ask whether the fireplace can be used before that work is done. Never try to burn off a suspected deposit.
Plan the next visit
CSIA recommends a chimney inspection every year, with cleaning when needed. Burn well-seasoned wood suited to your appliance and follow its operating instructions.
Keep the inspection report with your home records, along with the contractor's contact details and next recommendation, so the history is on hand at your next appointment.