Interior detailing scope depends on materials, use patterns, contamination and the outcome you expect.

1. Start with materials
Leather, coated leather, fabric, Alcantara-like textiles, plastics and piano-black trim do not respond to the same tools or chemistry. A clear material inventory helps define a safer process.
2. Consider how the vehicle is used
Daily commuting, children, pets, food, rideshare work and long-term storage create different soil patterns. The service should respond to actual use rather than a generic package name.
3. Separate soil from odor
Visible dirt and persistent odor are related but not identical problems. Odor work may require source removal, additional dwell time and realistic expectations about porous materials.
4. Flag sensitive areas
Loose trim, damaged coatings, aging leather and electronic controls should be documented before work starts. Good intake reduces surprises and helps protect delicate surfaces.
5. Agree on the desired finish
A maintenance clean, a restorative reset and a sale-preparation detail have different priorities. Photos and a short list of outcomes make the scope easier to compare.
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The checklist format makes it much easier to understand what should be discussed before an appointment.
I would also take a few condition photos before handover so both sides have the same reference point.