Start with the cleaning duty, not the machine list
A commercial cleaning tender usually describes the work by area: the forecourt, the waiting room, the plant room, the forecourt tanks, the yard. That is how the client sees the site, but it is not how a commercial steam cleaning equipment specification is written. For any site where the cleaning includes heat and water onto surfaces, the specification has to answer a different question: what is being removed, how often, by whom, and what happens to the water afterwards.
Getting that order wrong is expensive in two directions. Specify too little and the contractor arrives, cannot shift the deposit, and the site ends up with a variation order and an unresolved complaint. Specify too much and the client is charged for a capability they never use, and the contract is undercut by a competitor who assumed a smaller job. Below is the sequence I would follow when turning a set of cleaning duties into a written specification, using a fixed machine as the worked example because it carries the most site-side requirements.
Classify each task by what has to be released from the surface
Three broad soil types cover most of what a commercial site asks a cleaning contractor to remove, and they respond to different inputs.
- Loose soil — dust, sand, grit, spilled dry product. Physical removal is enough; water is only carrying the soil away, and heat adds little.
- Compacted soil — mud that has dried in a tread or a seam, packed silt along a kerb, residue in a joint. This needs pressure and some heat to break the bond, plus time for the water to work.
- Baked-on or oily soil — grease, oil film, cooking fat, hydraulic fluid, sugar-based residue that has polymerised. This is where heat does the real work; cold water moves the surface and leaves the film.
Put each cleaning task in the tender into one of those three columns and note how long the deposit has been there. A forecourt that is cleaned weekly is a different machine from one where oil has been baking through a summer. Once you have that table, the specification question becomes answerable: can the equipment on offer release the third column, and how quickly? The Fixed Steam Cleaning Machine PowerDe HW02 page publishes a steam temperature of 160°C and a vapour pressure of 0.8 MPa alongside a 6 kW heater, and that combination is aimed at baked-on and oily deposits rather than loose dust. If the site's tasks are mostly in the first column, that is not the right line of spend and the specification should say so.
Write mode selection into the specification, not just power
Sites that combine hard surfaces with equipment or electrical panels need the amount of free water to be controllable, and the practical way to control it is a machine that switches between dry and wet steam. Dry steam carries less free water, so it suits degreasing a surface that has to come back into use straight afterwards; wet steam transfers more heat and flushes the released soil, at the cost of leaving more water behind. A dry and wet steam cleaner handles both in one shift; a single-output machine forces the contractor to work around it, which usually shows up as scrubbing by hand in the areas nobody wanted to soak.
Ask the supplier to state, in writing and against the quoted configuration, which modes the machine has and how the mode is changed. "Modes available on the range" is not the same answer as "modes available on the unit being delivered", and tenders are won and lost on that difference. Where the client's tasks also include flushing with hot water rather than steam, check that as a separate item — the mobile machines in the PowerDe cleaning range are listed with dry steam, wet steam and hot-water modes, while the fixed units are described with dry and wet steam.
Site services: three questions that decide the fixed-versus-mobile choice
A fixed machine is a permanent installation at a wash bay or plant room, and it makes three demands of the site. Write the answers into the tender before you compare prices.
- Power at the point of work. A 6 kW heating load on a 220 V supply needs a properly protected and earthed circuit run to where the cleaning happens, not an extension lead across a walkway. Ask the client's facilities team for the socket type, rating and distance to the wash point.
- Water at the point of work. The HW02 page lists an 80 L stainless (SUS304) tank with a tap-water inlet using a 4-point internal-tooth fitting. That tells you two things: the site needs potable water reaching that fitting with the right thread, and the tank size sets how many refill trips a shift takes. A refill trip is labour, and labour is the number the client actually pays for.
- Where the run-off goes. Steam uses far less water than a hose, but the run-off is not clean — it carries oil, grease and grit. Confirm the drainage route, whether an interceptor or silt trap exists, and what the local discharge rules allow. This is a consent and civils item, and it belongs at the front of the programme, not at handover.
If any of those three answers is "no", the fixed option is the wrong shape and the mobile machines in the same range are the ones to evaluate, accepting that a battery carried machine brings its own charging arrangements and duty limits in place of a fixed cable and tap.
Footprint, access and how the cleaning actually moves through the site
A fixed unit sits in one place and the work radiates from it. The HW02 page gives an overall size of 1,200 × 800 × 1,200 mm including handles, which is enough to check a plant-room corner or a bay wall for space, and the reach of the job is then set by hose and wand length. Ask for those lengths against the quoted configuration; they determine whether one position covers the task or the operator is dragging and re-routing constantly.
Where the work moves — several bays, indoors to outdoors, a forecourt one hour and a workshop the next — walk the route and measure the pinch points: shutter height, door width, turning space between vehicles, ramps, drainage channels, and whether the area has to stay in service while cleaning runs. Then choose the form factor the route supports rather than the model you first liked. A hand-pushed machine, a fixed unit and a driving-style machine are three different shifts, and the tender should record which one was assumed when the price was built.
Separate documented applications from custom scope
This is the clause that protects the buyer, and the one most often skipped. The HW02 product page documents vehicle exterior cleaning at fuelling and parking sites, interior vacuuming and disinfection, and engine-compartment cleaning. Kitchen extraction, machine-tool tables, food production and livestock housing are not on that page. If the tender needs those duties, they must be agreed as a written custom scope before award rather than inferred from a brochure — the site is then buying something the standard specification does not cover, and that needs to be priced, warranted and serviced as such.
Put the same discipline on the safety claims. The HW02 overview lists protection against leakage, short circuit, high temperature, high voltage, water shortage and high-voltage explosion. Rather than repeat a count, ask the supplier to list the protections fitted to the unit being quoted, state how each indicates a fault to the operator, how each is reset, and whether it stops the machine or only alarms. Then test them on the delivered machine at commissioning, with the operator present, and record it.
PowerDe describes itself as an intelligent cleaning equipment manufacturer and lists customised configurations and engineering services alongside standard products, so an out-of-scope duty is a conversation worth having. Start it with written site conditions, not a brochure request.
Downtime, spares and the response the contract depends on
Ask the client which cleaning tasks sit on a critical path. If a wash bay has to clear vehicles every shift, a machine fault is not a maintenance ticket but a stopped operation, and the response terms belong in the comparison alongside the price. Specify the wear items — nozzles, seals, hoses, heater elements, switches — with order numbers and prices, agree what is kept on site, and confirm the lead time to the delivery country and who can be called without voiding support. Where the machine is one of several across a portfolio, ask whether the settings and records can be replicated, because re-commissioning at each site is a cost that is invisible in a unit price.
Trial on the site's own soil before the specification closes
Do not accept a demonstration on a sample the supplier prepared. Pick the dirtiest representative surface at the site, mark the same area, photograph it at the same light and distance, and run the trial with the operator who will actually do the job. Record four things: time to cold-start and reach working output, minutes per task, water consumed and how many refills that took, and whether output held steady through a continuous run rather than only at the first trigger pull. Note any part of the area the operator had to avoid, and any workaround they invented — both are design faults in the specification, and the trial is the last cheap moment to fix them.
Define what "clean" means for each zone before the trial, not after: visually clean at eye height, a wipe test, a white-glove check, or a documented hygiene standard with a named responsible person. And be precise in the paperwork about the limit of the claim — a cleaning machine removes soil. Whether that is sufficient for a client's hygiene standard is a decision for the client's own responsible person, based on their requirements and the evidence from the trial, not something a machine datasheet settles.
Information to send the supplier before you ask for a price
- The task list with each item classified as loose, compacted or baked-on, and how long the deposit accumulates.
- Photographs of the wash point including drainage, sockets and the nearest water tap.
- Supply details at the wash point: socket type, rating and cable distance.
- Whether a potable tap can reach the inlet fitting, and where run-off is allowed to go.
- Measured door widths, shutter heights, narrowest passage, ramps and any area that must stay in service.
- Minutes available per shift, number of vehicles or surfaces per shift, and who operates the machine.
- A written list of surfaces and components that must not be sprayed.
Those seven items let a competent supplier answer with a configuration instead of a catalogue page, and they make bids comparable, which is the real point of the specification. Shenzhen PowerDe Automation Precision Equipment, the manufacturer behind the PowerDe cleaning range, takes customised enquiries from written site conditions through its solutions and engineering services, so sending this information before requesting a price is worth the ten minutes it takes.
What to hold onto if the tender document has room for only one page
If everything else has to go, keep five lines: the soil each zone actually has; the power and water that exist at the wash point, not on the drawing; where the run-off goes and what treating it costs; the access route and the form factor it supports; and what happens when the machine is down. Price last. In a commercial cleaning contract, the differences between bids are rarely in the headline number — they are in the assumptions the number was built on, and a specification written in this order exposes them before award rather than after.
