Of the following conditions in a dry-van container, which one would require cleaning?

Cleaning is essential for maintaining the usability and hygiene of a dry-van container, particularly when any significant residue might affect the quality of goods being loaded. Coffee beans inside the container represent a contaminating substance that could not only impact the integrity of other cargo but may also affect the odor or cleanliness of the container itself.

The presence of coffee beans, if not removed, could lead to a variety of issues such as attracting pests, retaining moisture that could foster mold growth, or causing cross-contamination with other products, especially food items. Such residues do not simply result in a cosmetic issue; they can affect the logistics and handling of the cargo. Hence, this condition necessitates cleaning to ensure that the container is in a suitable condition for its intended use.

In contrast, raised mud footprints, dry dust over stains, and polyurethane beads, while they may indicate some level of dirtiness, typically do not possess the same potential for creating harmful impacts on cargo or hygiene standards. They could often be overlooked if they can be adequately managed through regular maintenance practices that would include sweeping or light cleaning. Cleaning priorities, therefore, are focused on residues that pose a risk to either the integrity of the cargo or the cleanliness standards expected for transport.