25 August 2026·5 min read·Cleanship Marine Services
The most expensive hold cleaning conversation is the one that happens after the surveyor has already said no. Almost always, the vessel had done work — sweeping, hosing, sometimes a full wash — and almost always, the work stopped at the point where the hold started to look acceptable.
Looking clean and being clean are different tests
A hold presented for a food-grade cargo is not being judged on appearance. It is being judged on whether any trace of the previous cargo remains, whether the structure is dry, whether there is any infestation, and whether there is any odour. Three of those four are invisible from the tank top.
That is why a hold can be swept to a genuinely high visual standard and still fail on the first check. The surveyor is not looking at the same thing the crew was cleaning.
Residue hides where nobody sweeps
Cargo residue does not distribute evenly. It concentrates in the frames, behind brackets, in the tank-top margins, under the hold ladders and in the bilge wells — the places a broom cannot reach and a hose pushes material into rather than out of. A hold cleaned from the middle outwards looks immaculate and holds the entire failure in its edges.
Different cargoes fail differently. Mineral fines stain and need chemical treatment. Cement and clinker set hard if the wash is late and then need mechanical removal. Fertiliser is hygroscopic and corrosive and it will not tolerate being left damp. Coal films every surface and settles again after each sweep, which is why cleaning between grabs is usually wasted effort.
Drying is the stage that gets skipped
This is the one that catches people out more than any other. A hold that has been washed properly and closed while still damp will fail — not on residue, but on moisture, and on whatever moisture then encourages. In a humid port, or during the rains, a hold will not dry on its own inside the time available.
Drying is not a passive stage. It needs ventilation, it needs time, and it needs the sequence planned so the holds finished first get the longest to dry. Working forward-to-aft rather than all-at-once is the difference between a hold that dries and a hold that is merely no longer wet.
The standard is set by the next cargo, not the last one
This is the framing that makes the rest of it obvious. What the hold carried last determines how much work there is. What it carries next determines when the work stops.
A hold going from coal into coal needs very little. The same hold going from coal into grain needs the full sequence — sweep, wash, chemical treatment matched to the residue, rinse, dry, and a bilge system that has been cleaned and tested rather than assumed. Planning backwards from the inspection is the only version of this that reliably passes.
Where the time comes from
The honest constraint is almost never the cleaning; it is the window. A berth that will not be held open, a discharge that finishes hold by hold, a surveyor booked for a fixed morning.
Which is why the answer at a fast-turnaround port is usually not a bigger gang. It is a gang that starts as each hold empties and a riding crew that finishes the rest on the passage out — a passage the vessel was making anyway, on which the cleaning costs no port time at all.
Frequently asked
What is a grain-clean standard?
A hold condition acceptable for loading grain: free of any previous cargo residue, dry, free of infestation and free of odour, with the bilge system clean and tested. It is inspected by a surveyor before loading and it is not a visual standard — three of the four checks cannot be judged by looking at the tank top.
Why does a washed hold still fail?
Most often on moisture or on residue in places a broom and hose do not reach — the frames, behind brackets, the tank-top margins, under the ladders and in the bilge wells. A hold washed properly and closed while damp will fail on the drying, not the washing.
How long does hold cleaning take?
It depends on the number of holds, the residue from the last cargo, the standard the next fixture demands and how much of the vessel's stay is actually available. The cleaning is rarely the constraint; the window is. Where the window is short, the work starts alongside as each hold empties and a riding crew finishes it on the passage.
Can the crew do it instead?
For a light change of cargo, often yes. For a full grain-clean after a dirty bulk cargo, it takes people, chemicals and time that a working crew does not have spare — and a failed inspection costs more than the gang would have. The trade-off is worth making deliberately rather than by default.
