By Ian Adams, Owner of Speciality Wipes
A cleaner has finished wiping down the control cabinets on the factory floor and moves into the adjoining server room. There’s a mark around a rack handle, so they remove it with the same wipe used elsewhere. The perforated metal door is dusty too. They run the cloth across it, pressing harder where dirt has settled around the holes.
The job sheet says ‘wipe down external surfaces’. Nothing they’ve done appears to contradict it.
It’s that last movement across the door I’d question.
Working in specialist wipe manufacturing, I’ve learnt that removing the visible dirt is only part of a wipe’s performance. I’m interested in what the material does under pressure, particularly when it meets a rough edge, and what happens to the liquid held inside it. A product that works well on a painted machine guard hasn’t necessarily been assessed against a server cabinet with air passing through it.
The problem isn’t that factory cleaners lack experience. It’s that an instruction written for one kind of surface can follow them into a room where the same action has quite different consequences.
Watch what happens when the cloth reaches the grille
Wipes behave differently depending on the surface. Folded wipes lie flat against solid frames, but they dip slightly into punched grille openings. As the hand travels sideways, the metal edges can catch the material. Whether it snags depends on the metal’s finish, the wipe material and how much pressure is applied.
Picture a scenario where the first pass of the wipe leaves a line of dust along the lowest row of holes. The cleaner then folds the sheet again to expose a fresh surface and works backwards over the mark. This time, they press with their fingertips to reach the dirt around the openings. The pressure is now concentrated on a much smaller area of the wipe, pushing the material further against the metal edges.
If a loose fibre catches, the movement of the hand can pull it away from the sheet. The cloth itself might still look perfectly intact. Even a small amount of material left around the holes would be difficult to spot without examining the grille closely.
If the cabinet draws cooling air through this panel, fibres shed by the wipe may be drawn through the openings. Once inside, they can contribute to the build-up of dust around cooling components. ASHRAE’s guidance on particulate contamination in data centres identifies fibrous dust from textiles as a potential source of fouling around heat sinks, where accumulated material can interfere with heat transfer.
A single fibre is unlikely to cause an immediate failure. The concern is that material can gradually accumulate through repeated cleaning in an area where contamination already needs to be controlled.
From a wipe manufacturer’s perspective, this is the point where a product description needs closer scrutiny. ‘Strong’ may mean the sheet doesn’t tear easily in normal use. ‘Low-lint’ doesn’t mean there’s no fibre release when its edge catches on metal.
Two nonwoven sheets can look and feel remarkably similar while responding differently to contact with a rough surface. Look at how the material is bonded. Then look at the cut edge, which may behave differently from the main face of the sheet when it’s drawn across perforations.
Ask the supplier for relevant fibre or particle release information and find out how the material was tested. A result obtained from a dry sample under one test method doesn’t establish how a wetted, folded sheet will behave against punched metal. IEST-RP-CC004.4 provides methods for evaluating wiping materials used in controlled environments; it isn’t a universal pass certificate for every cleaning task.
Where you are permitted to clean the grille, I recommend one preliminary check. Take an unused section of matching perforated metal, away from the operating equipment, and repeat the planned wiping motion. Does the wipe drag at the grille openings? Are any fibres caught on an edge? This is less conclusive than proper release testing, but it will show whether the sheet snags and should therefore be kept away from the live cabinet.
And if the equipment instructions prohibit cleaning the grille, there’s no reason to trial a wipe for it at all.
How much liquid does a pre-saturated wipe release?
A pre-saturated wipe removes the guesswork of adding cleaning fluid, but it doesn’t guarantee how much liquid reaches a surface. That depends on the pressure applied, how the wipe is folded and the shape of the equipment.
Take a rack handle and a ventilation grille. A folded wipe may pass over the solid metal without leaving excess moisture. Press that same wipe into a dusty grille, however, and the compressed material may release liquid into the openings.
The outside may look dry, but that doesn’t mean moisture hasn’t passed through. If it reaches circuit boards, connectors or power equipment, it could cause electrical faults or short circuits. Trapped moisture and cleaning residues may also contribute to corrosion over time.
Cisco, for example, warns against allowing liquid into vents in its enterprise networking equipment disinfection instructions. It also requires equipment to be powered down and disconnected before disinfection. These instructions shouldn’t be treated as blanket approval for cleaning other equipment.
Repeated folding and pressure can also change how liquid is distributed through the wipe as the job progresses. A product that’s suitable for a smooth external panel may therefore behave differently when pressed against a grille.
If a wet line appears around a ventilation opening, the cleaner can’t tell what’s reached the other side. That’s not something they want to discover while cleaning an operating cabinet.
A dusty grille can be a correctly finished job
There’s a less obvious reason these cleaning rounds go wrong. Imagine the supervisor inspecting the room afterwards. The frame looks clean, but a strip of dust is still visible around the perforations. If the work order simply says ‘external surfaces’, it’s understandable that the cleaner would expect to be sent back to finish it.
So settle the boundary at the rack, not back at a desk.
Have the facilities supervisor and the IT equipment owner look at the actual cabinet and the instructions for that model. Where routine cleaning of the handle and solid frame is permitted, name those surfaces and the approved method. If the ventilation door isn’t included, write that down. Don’t lump it in with the rest of the ‘external cabinet’.
For small server rooms, a picture of the front of the cabinet with the permitted areas clearly marked can be more useful than a written description. Store this with the job sheet. Then ask the regular cleaner to point out exactly where the wipe should be used. If they point to the grille, the instructions need to be more specific. Don’t wait until a routine cleaning round to check how the instructions are understood. One misplaced wipe could introduce fibres or liquid through an opening before anybody realises the instructions were unclear.
What happens to the dust is equally specific. Record the rack and the affected area, such as ‘lower half of front ventilation door’, and pass it to the equipment maintenance team. They can check the manufacturer’s procedure and decide if specialist cleaning, isolation or a planned shutdown is required. A cleaner shouldn’t open the cabinet or work around ports and internal components to make the inspection sheet look complete.
I understand why that might seem awkward in a factory that values consistency. But the same operator who can safely remove oil from a control cabinet door may not have the authority to clean an air intake in the adjoining server room. Dust still being present isn’t evidence that they failed the job. The responsibility may simply belong to someone else.
Back on that cleaning round, the completed job sheet might say: ‘Rack 2 handle and frame cleaned. Dust across the lower front grille referred to IT.’
That’s a far more useful record than a tick beside ‘server room cleaned’, especially when nobody can say exactly what the wipe touched.
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