Chemistry, dilution control, consumables and waste streams

Dilution control and why it matters

Cleaning products that are supplied in concentrated form and diluted at point of use are more predictable in application than ready-to-use products. The dilution ratio determines the effective concentration on the surface. If the ratio is not controlled — if operatives mix product by eye or by habit — the concentration on the surface varies, and the result varies with it. Over-dilution reduces effectiveness; under-dilution can damage finishes, leave residues, or create hazardous conditions for building occupants.

Dilution control is achieved by specifying the dilution ratio for each product in the finishes register, and by using dispensing equipment that delivers a consistent ratio at the point of use. The dispenser removes the judgement from the operative and makes the dilution a process, not a decision.

Ready-to-use products do not require dilution management, but they are more expensive per unit volume and they generate more packaging waste. For high-volume applications — large floor areas, high-frequency sanitary cleaning — concentrate-and-dose is the more economical and more consistent approach. For low-frequency or specialist applications, ready-to-use may be more practical. The choice is made per product category and recorded in the specification.

Product selection follows the finishes in the building, not a house preference. That position is not a preference — it is a constraint. A product that is appropriate for sealed vinyl tile may not be appropriate for unsealed concrete, polished stone, or a coated glass partition. The finishes register is what connects the product selection to the surface it will be applied to.

Surface compatibility and the finishes register

Surface compatibility is not a secondary concern. The wrong product on the wrong surface causes irreversible damage to finishes that are expensive to replace. The most common damage scenarios in commercial premises are: acidic or alkaline products on natural stone; solvent-based products on coated or printed glass; abrasive materials on polished metal or mirror surfaces; and incompatible chemicals on specialist floor coatings. None of these are obscure edge cases — they occur regularly in buildings where the finishes register was not compiled or was not consulted.

The finishes register records every significant surface in the building: its type, its finish (sealed, unsealed, coated, natural), any manufacturer guidance on compatible products, and any finish-specific restrictions that were noted during the walk-through. It is compiled before the specification is drafted, and it is the reference document for every product selection decision in the contract.

Where the building contains a surface type that is unusual or where the manufacturer's guidance is not available, the method for that surface is agreed with the buyer before service commences. The method is written into the specification and is not varied without a written instruction. That approach may add time to the specification process, but it is the only way to avoid surface damage that the buyer has no recourse over once it has occurred.

Compatibility notes are general guidance only. Every building's finishes are recorded specifically during the walk-through.

Colour-coded equipment separation

Colour-coded equipment separation is the practice of assigning different colours of cleaning equipment — cloths, mops, buckets, gloves — to different areas or surface types, so that equipment used in a sanitary area is never used in a food preparation area, a clinical contact area, or a general surface area. The principle is cross-contamination prevention, not aesthetics.

A colour-coding scheme is only effective if it is consistently applied and consistently understood. An operative who does not know the scheme, or who does not have access to the correct colour of equipment on a given visit, will default to whatever is available. The specification should state the colour scheme in use, the area assignments for each colour, and what the operative is required to do if the correct equipment is not available (which is to report it, not to substitute).

The standard colour-coding convention used in many commercial and healthcare cleaning contexts assigns distinct colours to: sanitary areas, kitchen and food contact surfaces, general surfaces, and clinical or high-risk areas. The specific scheme is agreed during specification development and noted in the specification. Where the building includes a clinical or food area, the scheme is extended or adapted to reflect those requirements.

Colour assignments are illustrative. The scheme for each building is agreed and written into the specification.

Consumables and who supplies them

Consumables are the items used up in the course of cleaning that need to be replenished: hand soap, paper towels, toilet tissue, bin liners, sanitiser and dispenser refills. The question of who supplies them — the contractor or the buyer — is a commercial decision that needs to be made at the outset and written into the specification.

There is no standard answer. In some contracts, the cleaning contractor supplies all consumables and factors the cost into the contract price. In others, the buyer supplies consumables and the contractor's operative replenishes from the buyer's stock on each visit. In some contracts, the responsibility is split: the contractor supplies bin liners; the buyer supplies paper and soap. Whatever the arrangement, it is written in the specification, and the consumables clause states what the contractor's operative is required to do when a consumable item is running low or has run out.

Where the contractor supplies consumables, the specification should state the product category (hand soap, paper towels) but not the brand — product selection within a category can change without a specification revision, but the category itself is a commitment. Where the buyer supplies consumables, the specification should state a stock level that the buyer is responsible for maintaining, and a reporting requirement so that the contractor can flag low stock without being responsible for the resupply.

Dispensers — soap dispensers, paper towel dispensers, hand sanitiser units — are a separate question from consumable supply. Where the contractor installs dispensers, the responsibility for maintaining and replacing them needs to be stated. Where the dispensers are the buyer's property, the contractor's responsibility is limited to replenishing the consumable, not servicing or replacing the dispenser.

Waste streams and segregation

Waste management in commercial premises in Ireland is governed by the Waste Management Act 1996 (as amended) and the European Communities (Waste Directive) Regulations 2011. The Waste Management (Presentation, Segregation and Storage) (Amendment) Regulations 2023 set requirements for the segregation and presentation of waste by commercial businesses. Broadly, commercial premises are required to segregate waste into specified streams — general waste, dry mixed recyclables, organic or food waste where applicable — and to present each stream in the correct container for collection by a licensed waste contractor.

The cleaning operative's role in waste management is to collect waste from bins within the building and transfer it to the building's designated waste point — whether that is a bin room, a waste store, or a designated external area. The operative segregates waste as collected, or sorts it at the transfer point, into the streams that the building's waste collection arrangement supports. They do not arrange for off-site collection, they do not operate the bin lift, and they do not handle clinical or hazardous waste.

Where the building has a recycling programme, the specification states which streams the operative is responsible for managing and which are the building occupant's responsibility. A programme in which the operative empties general waste bins but the occupant is responsible for placing recyclables in the correct containers needs to be stated explicitly — otherwise the operative's role defaults to whatever they observe, which may or may not align with the building's waste management policy.

Confidential waste — shredded or unshredded documents, data-bearing materials — is outside scope. Its management is a matter for the building operator and, where relevant, a specialist contractor. The cleaning operative is not to handle, sort or read document waste.

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