First: which joints are you actually looking at?
Grout is not one surface, and a question set that treats it as one produces a meaningless trial. Write the joints down as separate rows before you ask anything else, because each row carries its own risks: butt joints between porcelain or quarry tiles where the filler sits below the tile face; wide joints set deep, which trap whatever falls on them; cracked or crumbling sections; joints refilled recently with a different material; joints at wall junctions and skirtings rather than in the field of the floor; perimeter joints and movement joints, which are designed to move; and the joints under and behind equipment, which are usually the dirtiest and the hardest to reach.
Add the floor build-up to the same sheet, because grout is only the top of it: the waterproof membrane, the adhesive bed and the subfloor all sit under a joint, and none of them can be inspected from above. A question about a joint is therefore really a question about three layers you cannot see, which is why the answers have to come from the person who laid the floor or from records of the work, not from a product page for commercial kitchen floor steam cleaning.
Questions that confirm the condition of the grout itself
These come first, because a joint that is already failing will not be improved by any cleaning method, and heat and water pressure can make a bad joint worse. Ask, and write the answers down: is the joint solid across its full width, or does it sound hollow or flex when pressed? Are there cracks, chips, or missing lengths, and how many tiles in the trial area are affected? Is the joint level with the tile face, sitting proud of it, or recessed? Has the joint been sealed or coated, and with what, and when? Does the colour come from the material itself or from a staining product? Is any joint visibly sunken at a perimeter or at a junction with another surface?
Then separate the cosmetic question from the structural one. Discolouration, a rough surface, and a film that will not lift are cosmetic problems, and they are the ones a cleaning method is being asked to address. Loose filler, a gap that a probe disappears into, a tile that rocks, and a crack that runs into the adhesive bed are structural problems, and they belong to a repair order, not to a cleaning order. Put them in two columns on the sheet. If the second column is not empty in the trial area, get the repair quoted before the cleaning question is settled.
Questions about water reaching the build-up below
A steam lance puts out far less water than a hose, and that is the point of asking about water at all: less water is not the same as no water. The question set here is about where moisture can go and where it can get out. Is there a continuous waterproof membrane under this floor, and does it turn up the walls and seal at the junctions, or was it interrupted by a later equipment installation? Does the floor fall towards a drain, or does it hold water in places? Are the joints sealed, or open, so that anything poured on the floor runs into the adhesive bed? Is there a movement joint that has been filled with something rigid? What is below this floor: a ceiling, a store, electrical distribution, or another kitchen?
Ask the same questions in reverse as a check. If water gets under a joint, how would anyone know? The honest answers usually point at edge lifting, a hollow sound appearing later, or discolouration creeping outward from a joint line, and all three show up weeks after the work rather than during it. That delay is the reason a grout area should be tested in a place where a problem would be visible and cheap to fix, and the reason the dry check described later is not optional.
Questions about what is actually in the joint
Two joints of the same age in the same kitchen can hold completely different deposits, and the deposit decides what any method can achieve. Which is it in the trial area: baked-on grease that has been walked over and compacted; sugar and starch from sauces and wash-down that has gone hard and sticky; mineral scale from hard water and spillage; a combination; or simply loose grit that has never been swept out? Has the joint ever been cleaned deeply before, or only mopped, which tends to move grease around and push it into the joint rather than remove it?
This distinction matters commercially more than technically. If the joint holds loose grit and a thin grease film, an ordinary routine may already be close to enough and the change worth paying for is small. If the joint holds years of compacted deposit, the question becomes how much of it can be lifted at all, and that is only answerable on the floor. A supplier who promises a result before seeing the deposit is guessing; a supplier who asks for photographs of the joint, the tile edge and the surrounding area is doing the same job you are. That is the moment to send the sheet to the supplier behind customized steam cleaning equipment, and to ask them to answer against the sheet rather than against a brochure.
Questions about heat, dwell and time on the joint
Heat does the work on grease, and heat needs time on the surface, which is where a floor joint differs from a benchtop. The joint is recessed, horizontal or vertical, and often shaded by the tile faces on either side. So ask: how long can the lance be held on a joint before the tile face, the adhesive bed or a sealant is affected, and who says so? Does the joint material tolerate heat, and does the sealant, if one was applied? Is there a difference in tolerance between cement-based and epoxy or resin grout, and are both present in this kitchen? Where equipment sits close to the floor, is there room to hold the lance at the angle the operator would need?
Do not accept a single number as the answer to these questions. A published figure on a machine page describes that machine, not your joint, and the wiki-level caution applies in the shop too: what matters is what happens on this floor. Ask instead for the method: how long, at what distance, with what attachment, followed by what extraction or wipe, and repeated how many times. Those are answerable in writing and testable on a marked area.
Questions about the floor around the grout
Nobody cleans a joint on its own; the surrounding tiles take the same heat and the same water. Are the tiles glazed, polished, unglazed, or a matte technical surface? Are any of them cracked, chipped, loose, or recently replaced with a different batch? Is there an anti-slip treatment or coating on the floor, and was it applied over the joints as well as the tile faces? Are the tiles slippery when wet beyond the level the site accepts, and does that change the order of work, since a wet cleaning method on a floor people walk on is a safety matter before it is a cleanliness matter?
Ask what happens to whatever comes off the joint. On a floor it cannot fall away: it sits in the joint line, at the tile edges, and along the perimeter, and it has to be lifted or extracted before it dries back in. That single operational fact usually decides whether a floor method is workable at all, and it is the reason to ask about extraction, cloths, squeegees and the drainage route in the same conversation as the cleaning result.
Questions about operations while the floor is being cleaned
The kitchen will not stop for the trial, so these questions decide whether any method survives contact with service. Which hours can the area be closed, and for how long, and who signs that closure? Can equipment be moved or lifted, or does the work have to be done around fixed legs and frames? Where does run-off from the area go, and does it cross a walkway or a food-handling zone on the way to the drain? Is the drain the right one, and is it fitted with the interceptor or trap the site's drainage rules assume? What has to be protected nearby, and who covers it before the first pass and removes the coverings afterwards?
Write one line for each of these in the trial record. Most abandoned floor trials fail on this section rather than on the cleaning itself: an area that cannot be closed, run-off that has no legal route, or a floor that must be walked on before it is dry.
Questions about the hygiene rules the trial cannot overrule
Steam cleaning a floor joint is a cleaning method. It is not a disinfection result, and it does not replace the cleaning product or procedure your food-safety system specifies. Ask the technical manager what the site standard actually requires for floor joints, whether that standard allows the method under test, and what evidence the site will accept that the floor is safe to return to service.
Then ask how the trial will be recorded so that it can be reviewed rather than argued about afterwards: photographs taken before and after at the same distance and light, the area marked out and measured, the pass condition written for each joint type before the trial rather than decided when somebody looks at it, whether the site standard sets a time for the floor to be dry and whether the closing checklist can be signed while the floor is still damp, and the names of the person who did the work and the person who inspected it. If your auditor would not accept the sheet, the sheet is not finished.
Questions that decide the trial area and the pass condition
Choose the test area for information, not for appearance. Pick two or three small areas rather than one impressive strip: one in the field of the floor, one at a wall junction, and one awkward area near equipment where the deposit is worst and the reach is poorest. Photograph each. Include at least one joint of each type in the list from the first section, and treat any joint with a crack, a gap or a loose tile as off-limits, so that a cleaning result is never confused with a repair problem.
Write the dry check into the pass condition, not as an afterthought. It is simple: the area is left dry, and it is inspected again after it has been left alone, at the same spots, for any new discolouration at a joint line, any lifting at an edge, any hollow sound, and any change in how the tiles feel underfoot. If the second inspection shows nothing, the method has passed on this floor. If it shows something, you have learned it in a small area, which was the entire point of the trial.
Questions to put to the equipment supplier in writing
Send the sheet, and ask for the answers in the same order. Ask what supply the unit needs, and whether the site can provide it at the point of work: the connection, the water inlet and its fitting arrangement, and the power arrangement. Ask which mode is intended for floor joints, and what the supplier recommends for a joint that has been sealed as opposed to a joint left open. Ask how the loosened deposit is removed, and what is supplied to remove it. Ask what the unit's site footprint is, whether it can be moved into the kitchen through the doors that exist, and whether it can work in the gaps where the worst joints are.
Ask for the figures for the exact unit on the quotation, and read them as the characteristics of that machine rather than as a prediction for your floor. Ask which safety provisions the unit carries, and note the items rather than a total, since the wording of these lists varies across the site's own pages. Ask whether a trial or demonstration on a floor like yours is offered, and on what terms. Ask what support exists if the trial goes badly, and what the site must do about a floor that has been damaged during a trial.
Questions about the routine you keep afterwards
The question a floor owner usually forgets is what stops the joint filling up again. Ask what the daily and weekly routine is doing to the joints: is the floor being mopped in a way that pushes grease into them, is the rinse water being changed often enough, is the drain being cleaned, and is the area around equipment reached at all? Ask which routine the team can actually keep, written as a short list with the deposit each task addresses, rather than as a long document that nobody follows on a busy service.
Ask what will trigger the next deep clean, and what will trigger a repair instead: the same photographs at the same spots on a review date, the joint condition recorded on the sheet, and a decision point written down in advance. The comparison between steam, hot-water washing and the current manual routine is worth making on your own floor with your own numbers, and the record described above is what makes that comparison honest. If the answers you collect point towards a machine rather than a mop, PowerDe cleaning equipment and the company behind it are worth approaching with the sheet in hand, since the sheet is what lets a supplier answer the question instead of selling a catalogue.
