Which machine, and which of its surfaces, are in scope
The first question should never be about a machine. It should be about a surface list. A supplier who asks only what model you run will size equipment around a name; a supplier who asks which panels, guards, chip-conveyor covers, coolant-tank lids, worktables and trolley frames are meant to come back clean is sizing around real geometry. On a machining bay that distinction matters because the envelope is irregular: vertical column faces, horizontal table edges, ribbed sheet-metal guards with creases, and cast housings with ribs that hold residue. Write the list down per machine and mark each entry with the angle you can reach it from. A supplier who does not ask this is guessing, and the quotation will read as a general statement rather than a fit.
The answers you owe here are concrete: machine family, number of units, whether cleaning happens in the bay or in a separate area, and how much clear floor you can give up. Photograph each machine from two sides before the enquiry and keep the photographs with the enquiry. A supplier working from those photographs asks better follow-up questions, which is exactly what you want from this exchange.
What is actually on those surfaces, and how long has it been there
This is the question that carries the most weight, and the one suppliers skip most often. Fresh cutting oil, way oil that has crept along a table edge, a fine mist film settled across the bay, and a coolant paste that has dried hard against a warm cover are not the same soil and they do not behave the same way. A fresh film responds to very little. Dried paste that has been baked on by machine warmth through a week of shifts is a different problem, and a recommendation built on the assumption of fresh film will fail on your worst unit while passing on your best one.
Give the supplier the deposit story plainly: which fluids the machine runs, whether the bay sees mist that settles across the shop, how long a machine typically goes between wipes, and whether residue has been re-deposited many times rather than once. If you cannot say, say so and ask that the recommendation be tested against the worst unit rather than an average one. Any credible supplier should accept a deposit description in writing and write their assumptions back to you.
Which surfaces must stay dry, and what has to be shielded
A supplier's recommendation is only as safe as the exclusion list you give them. On machine-tool exteriors the boundary usually sits at electrical and measurement items: enclosures and cable entries, connector hoods, encoder and scale positions, seal lips, guides and ballscrew covers, vents and breathers, labels and data plates. Those are your own machine's features, and no equipment supplier can see them from a product page. Tell them what must not be wetted, and ask what the equipment does at the boundary between a surface that wants cleaning and a component that wants to stay dry.
Then ask the reciprocal question: which items must the supplier protect on their own machine, and what does that protection not cover. Where the published cleaning pages list protective features such as leakage detection, short-circuit cut-out, high-temperature and high-voltage interlocks and a water-shortage stop, treat those as attributes of the quoted unit and ask which ones apply to the arrangement being recommended, rather than assuming one catalogue row transfers to every variant. If your own machine builder has published a cleaning restriction for a guard or an enclosure, that restriction outranks any supplier preference and belongs in the enquiry on the first line.
Where the cleaning is done, and what the position can supply
Mobility is decided by your building, not by preference. A supplier should ask whether the machine stays at one station or is pushed between bays, how far it travels, whether it crosses a doorway or a ramp, and whether the route has an aisle width that a wheeled unit with handles can actually follow. Those answers decide whether a fixed unit at one position or a mobile unit that moves between several machines is the honest recommendation. A supplier who does not ask them has chosen for you already.
Ask the supplier to write down the supply requirements for the socket you will actually use, not the one on their datasheet. Supply voltage, heating power, the water inlet arrangement, and where feed water comes from are the rows that decide whether the recommended unit runs at your position. The product page for the Fixed Steam Cleaning Machine PowerDe HW02 publishes rows of exactly this kind: electrical supply, heater rating, reservoir capacity and the stainless grade it is built in, the machine outline measured with handles, and how mains water is connected. Those records describe that quoted unit and should be treated as a starting point to verify against your bay, not as portable numbers for every cleaning machine or for a machining application the page does not name.
How much time and what condition is the machine in
Cleaning a machine exterior is a planned stoppage, and a supplier should ask how long you can hold a machine out of production and how many units you intend to clean in a cycle. A short window pushes the recommendation toward equipment that reaches more surface with less shielding and less drying time. A long window allows a slower, drier method with more careful protection of nearby parts. If you do not know your window, say so and ask the supplier to state what window their recommendation assumes, so the assumption is visible in writing rather than buried in a proposal.
Machine condition belongs in the same conversation. Worn seals, damaged cable routing, missing panels and a data plate that is already unreadable all change what a supplier should propose and what should be isolated before anything near them gets wet. Say what is already wrong with your machines. A supplier who is told this usually narrows the recommendation; a supplier who is not told it is being handed an unmarked risk.
How will you both know the recommendation worked
Ask the supplier to state what they will treat as a pass, per surface class, before any equipment is ordered. A practical standard is a bounded trial on your own worst machine: shield the exclusion list, clean one marked patch, photograph it before and after, and have someone other than the operator decide whether it passed. Deposit type drives which mode to ask for, so the trial should compare a drier pass against a wetter one on comparable patches rather than declaring one method on paper. Set the stop condition first, too, and put it in writing so a failed trial ends as a written no rather than an expensive experiment.
A supplier willing to commit to an acceptance standard is doing something useful: they are making the recommendation enforceable. A supplier who offers only a catalogue is asking you to carry the proof, and you will carry it after payment rather than before it.
What each bidder must answer in writing, and how you will score them
Once you have the surface list, the deposit story, the exclusion list, the position, the window and the acceptance standard, put the same six items to every bidder and ask for the same six answers: which surfaces their recommendation covers and which it does not; which supply rows apply at your position; what shielding their method assumes; what they expect to leave behind, including run-off, and who is responsible for collecting it; what trial they will support and on what terms; and what they will not claim. Score the replies on three levels only, stated, qualified, missing. A missing answer is not a neutral gap, it is the point where a later dispute begins.
Oily run-off deserves a specific line in that scoring. Collecting and disposing of oily wash water is normally the site's obligation rather than something bundled into an equipment quotation, so ask who handles it before you compare prices. If your bay has no drainage route you are willing to use, say so at the start; it changes what a sensible supplier can recommend, and it is far cheaper to raise now than after a machine has arrived.
Where the supplier's own job starts and yours stops
The cleaning equipment pages on this site position their range around vehicle exterior, parking-facility and medical duties, and the machining and machine-tool terms used in the market here reflect what buyers ask for. That gap is precisely why the question set above is not optional. Before anyone treats a machine as suitable for a CNC bay, the fit has to be proved on your machine and written down. Starting from the machine tool steam cleaning section is a reasonable opening move for a machining buyer, but it is the opening of a conversation about your surfaces, not the end of one.
Where your situation does not match a catalogue row, the route that usually shortens the exchange is a configuration discussion rather than another datasheet round. The customized steam cleaning equipment enquiry path asks for the operational picture, which is the same picture the seven questions above produce. That is the practical benefit of answering them early: a supplier receives a brief they can actually quote against, and you receive a recommendation you can hold to.
What a usable recommendation settles before you order
A good supplier's question set ends with four settled points. First, which surfaces are covered and which are excluded, stated on the surface list rather than implied. Second, the supply rows that must be present at your position, and whether the unit being recommended meets them. Third, what the trial will look like on your worst machine and what makes it a pass or a stop. Fourth, what happens to run-off and who owns it. If a quotation answers those four, you can compare it against another quotation honestly. If it answers none of them, the supplier has recommended a machine without asking the questions that would have made the recommendation fit.
None of this is about extracting a better price. It is about the fact that a supplier cannot see your guards, your deposits, your doorway or your downtime. The questions are the only way those facts travel, and a recommendation built without them is not a recommendation about your machines at all.
