A pest audit in the bin store: what attracted them

The auditor’s torch went along the wall-floor junction and stopped at a dark line about a metre long. Drain fly larvae, tracking from the gully towards the bin bay. The bins themselves were properly dosed, the lids were closed, and the load passed a tilt check that morning. None of that mattered, because the flies were not feeding on the load.

Solidifying waste removes the free liquid that pests drink. It does not remove the thin film of food residue on a bin wall, the damp patch under a lid, or the open sack of polymer on the shelf. A pest audit looks at all of it.

Three attractants gel does not touch

The first is the outside of the bin. Every time a liner is changed or a bin is tipped, a little material ends up on the rim, the handle and the wheel housing. That residue is enough to support flies and, in a warm store, it is enough to bring in ants. Wiping the rim and the lid every time the bin is closed takes fifteen seconds and is the single most skipped step in the routine.

The second is the floor. A bin store with a fall towards a gully is a good design, but only if the gully is trapped and cleaned. An untrapped gully in a food waste store is a direct route from the drain to the bin bay for anything that lives in drains.

The third is the sack. Polymer is not a food source, but an open sack in a damp room cakes at the surface, and the cake holds moisture and food dust. Rodents investigate it, and once they have learned the shelf is worth visiting, they will come back for the cardboard and the liners too.

The scoop problem

Scoops left in the bin are a small detail with a large effect. A scoop that has been used and dropped back into the load carries a coating of food waste, and it sits there for hours, warm and wet, at exactly the height where flies congregate under the lid.

Hang the scoop on a hook on the wall, or keep it in a lidded container beside the bin. If the design of the store does not allow that, attach it to the bin with a short chain so it cannot be dropped inside. This is a two-dollar fix that shows up in audit reports surprisingly often.

A weekly ten-minute routine

Once a week, before the store is hosed, do five things in order. Lift every lid and look at the underside. Wipe the rim and handle of every bin. Check the wall-floor junction on all four walls with a torch. Look at the gully for standing water and clean the trap. Check the polymer shelf for spilled granules and reseal the sack.

Log it on a sheet with a date and initials. The log is not for the auditor; it is so that the routine survives a change of cleaning contractor, which is when these habits usually disappear.

What the auditor writes down

In my experience the report rarely says ‘bins not solidified’. It says things like ‘evidence of insect activity at wall-floor junction’, ‘food debris on bin lids’, ‘open container of powder in waste store’, ‘no cleaning schedule displayed’. All four are preventable with the routine above, and all four read badly to a client or a landlord even when the waste itself is handled correctly.

One distribution centre failed an audit on a detail worth repeating: the cleaning schedule was displayed, but it was for the previous contractor and listed a bin store that no longer existed after a refit. The auditor treated an out-of-date document as evidence that no cleaning was happening. A five-minute update would have passed it.

Design changes that reduce the work

If you are refurbishing, three changes pay for themselves. A washable, coved skirting instead of a right-angle junction, which removes the line the torch found. A raised polymer shelf at 900 mm with a lip, so sacks are off the floor and spills are contained. And a gullies position outside the bin footprint, so that wash water runs away from the bins rather than under them.

None of these are about the gel. They are about the room the gel lives in, which is where most pest findings originate.

If you are preparing for an audit, the most useful preparation is a walk-through with a torch at the end of a shift, not a document review. Note what you find, fix the three cheapest items that week, and put the routine on the wall next to the dosing card. For the dosing side of the same audit, the polymer product information includes storage guidance that auditors tend to ask about.