The boundary belongs to you, not the provider
Laboratory and research areas operate under protocols set by the organisation using them, and no cleaning provider can infer those from a walkthrough. Decide the position for each space before quotes are sought: fully excluded, corridors and floors only, or a defined scope performed under supervision. Providers can price any of those; they cannot price an undefined restriction and an undefined restriction is the one thing nobody can quote against.
Be specific about surfaces as well as rooms. Benches, fume cupboards, equipment, sinks and waste containers may each have a different rule, and a general instruction to clean the laboratory will be interpreted more broadly than intended. Listing what is included is safer than listing what is excluded, because it removes any question about what an unmentioned item falls under and it prevents an unmentioned surface being treated as fair game.
