Treat unknown containers as a separate question
Do not combine unidentified liquids, powders, or products with general debris. Use the Northwest Vermont Solid Waste District's resources to ask about the actual materials and applicable collection arrangements. Describe building debris separately from old supplies or machinery. A container sized for wood and bulky contents may not be appropriate for every material uncovered during the cleanup.
Create a deliberate loading order
Place retained equipment away from the route helpers will use. Explain the outbuilding's approach and any maneuvering limits to the provider before delivery. Keep the retrieval space clear as the project progresses; moving the last unwanted items into a turning area can undermine the original access plan. Decide who will request collection after the owner has checked the cleared building.
Compare the identified load rather than the building size
Ask about accepted contents, included weight, rental duration, hauling, and exchanges. Clarify how newly discovered material or a longer sorting period would change the arrangement.