Where a reused textile would carry contamination between areas, or where laundering to a validated standard is not available.

In healthcare, laboratories and food production, the risk is that a cleaning textile picks up organisms in one place and deposits them in another. Single use removes that path entirely.

It also removes the dependency on a laundry process being correct. A microfibre programme is only as good as its washing, and where that cannot be controlled or verified, disposables are more reliable.

For outbreak response, isolation areas and contaminated environments, single use is usually specified outright.

In offices, retail, hospitality back-of-house and general commercial cleaning, none of that applies and laundered microfibre is cheaper and greener.

The honest test is whether the site can and does launder properly. If it can, disposables are being bought for convenience rather than hygiene.

A light oil or tackifier that makes dust adhere on contact instead of being pushed along the surface.

Untreated synthetic fibre pushes fine dust around. The treatment gives it enough tackiness to capture and retain particles without any static effect.

It is applied sparingly, so the head does not feel wet or greasy, but it can transfer a faint film to very smooth surfaces.

That film is unnoticeable on shelving, fittings, skirtings and blinds, and visible on mirrors, display glass and high-gloss finishes.

Untreated disposable heads exist for exactly those surfaces and for environments where any residue is unacceptable.

In food areas, check that the treatment is acceptable near food-contact surfaces - some are specified for it and some are not.

Disposables cost more per year in almost every case where laundering is possible; microfibre wins on cost and waste, disposables win on hygiene assurance.

A laundered microfibre head survives hundreds of cycles. A disposable survives one. Even including laundry cost, the reusable route is usually far cheaper over a year.

Against that, laundering has its own costs - collection, washing, drying, replacement of ruined stock - and those are easy to overlook when comparing purchase prices.

Waste is the other axis. Disposable heads are usually non-recyclable and, in volume, become a measurable part of a site's waste stream, which increasingly matters for reporting.

The sensible arrangement in a mixed building is disposables in the areas that require them and laundered microfibre everywhere else.

Buying disposables for the whole site because one ward needs them is the common and expensive mistake.

Often not - refill fittings are frequently proprietary, and that is a deliberate commercial design.

The handle is cheap and the refills are the recurring purchase, so manufacturers have an incentive to make the fitting specific to their range.

This matters at procurement: a decision to adopt one system commits to that supplier's refills for the life of the handles.

Check availability and lead times before standardising, since a refill that becomes hard to obtain strands the handles.

Some ranges use a generic clip or sleeve fitting that accepts third-party refills, which is worth seeking out.

Where several systems have accumulated across a site, consolidating onto one reduces both stockholding and the number of handles that sit unused because the wrong refills were ordered.

General waste in most settings, but clinical and contaminated areas may require a regulated waste stream - check the local classification.

In ordinary commercial cleaning, a used duster head is general waste.

In healthcare, a head used on a contaminated surface or in an isolation area may fall under clinical or infectious waste rules, with a defined bag colour and disposal route.

In laboratories and industrial settings, contamination with the substances handled there governs the classification.

The rules are jurisdiction-specific and site-specific, and the site's waste policy is the authority rather than a general assumption.

Whatever the route, heads should be discarded immediately after use rather than carried on the trolley or set down, since that reintroduces the contamination path single use was chosen to remove.

On capture, roughly comparable; on flexibility and cost, microfibre is ahead - and microfibre works damp, which disposables generally do not.

Treated disposable heads capture fine dust well and hold it, which is the primary requirement.

Microfibre also captures well and can be used damp for anything greasy or bonded, which widens its usefulness considerably.

Disposables have an advantage in consistency: every head is new, whereas a microfibre head's performance depends on how many times and how well it has been washed.

Structurally, disposable heads are lighter and less robust and can snag or tear on rough surfaces.

For the specific job of dry dusting in a hygiene-critical area, disposables are the better fit. For general cleaning, microfibre does more for less.

They are designed for single use, and reusing them defeats the reason for buying them.

A head that has been used is loaded with dust and, in the settings where disposables are specified, potentially with organisms. Reusing it reintroduces exactly the transfer risk single use eliminates.

Performance also drops. Once the treated fibres are loaded they stop capturing and start depositing.

They cannot be laundered - washing removes the treatment and the fibre structure is not built for it.

Where reuse is being considered on cost grounds, the correct response is to switch that area to laundered microfibre rather than to compromise the disposable system.

In audited environments, evidence of reused single-use items is a finding in its own right.