A tiled kitchen wall looks clean right up to the point where a steam wand is pointed at it. Grease that has drifted off the line and cured into a film does not show under normal lighting, but it turns into an emulsion the moment heat hits it, and the run-off carries the deposit down the tile face, into the joints and onto the floor. Before anyone books a steam window, the site should settle the questions below. They decide whether the job takes an hour or closes the kitchen for a day.
1. What the wall is actually carrying
Write down what is on the surface: cooking fat, sugar-heavy sauces, oil mist from a fryer bank, or airborne dust from a bakery area. Grease and burnt sugar need heat to release; dust and salt deposits do not, and heat only spreads them. Record where the deposit is thickest — usually the first metre above the cook line, the corners behind equipment, and the tile face near the extract hood intake. That map sets the pass count, the dwell time and how much detergent the task needs.
2. What the tile body and the format can take
Ceramic wall tile, porcelain wall tile and natural stone are not the same job. Stone is soft enough to etch and is often left unglazed at the face, which means it takes up both chemical and grease. Large-format tiles mean fewer joints but bigger unsupported areas behind the face; small mosaics mean more joints and far more time. Note the tile size and whether any area is fixed with adhesive only, since a wall that was never mechanically fixed will not thank you for a lance held close to it.
3. Grout, and what is behind it
Grout is the part that fails first. Cementitious grout is porous, holds grease and discolours where the deposit has soaked in. Check whether any joint is cracked, missing, or has been patched with a silicone that will not accept a cleaning agent. Grout at the base of the wall, where mopping water sits, should be inspected separately. If a joint is open, heat and pressure will push water behind the tile rather than out of it — repair those sections before cleaning, not during.
4. Waterproofing behind the wet zones
Any wall next to a sink, a hand-wash basin, a dish area or a dishwasher passes water through the joints on a normal day. Steam at pressure drives water further and faster. On walls where a tanking membrane or a boarded substrate sits behind the tile, the crew needs written instruction on how close the nozzle may come and how long it may dwell in one place. Where the substrate is unknown, test a small area behind equipment and check the far side of the wall before treating the whole run.
5. Adhesive strength on an old wall
Tap-test a few tiles in the worst area and in an area that has been repaired. A hollow sound means the tile is only held at the edges. Those tiles will lift under a pressure jet, and a lifted wall tile in a food area is a foreign-body hazard. Mark the hollow ones on the drawing, keep the pressure off them, and put replacement on the same work order.
6. Penetrations and what sits inside them
Tile cutting is not a seal. Around extract ducts, gas and water services, cable entries, electrical outlets, shelves and wall brackets there is usually a cut edge, an unsealed gap or aged mastic. High pressure will follow the path of least resistance. Walk the wall and list every penetration, then decide for each one whether it is sealed, whether the fitting behind it is water-rated, and whether it needs removal before the task. Anything with live terminals gets its supply isolated and locked, not taped over.
7. Fixings and loose items on the wall
Shelving brackets, hooks, notice boards, hand-tool racks, guards and guard rails all catch steam and all leave clean halos behind them once the wall is cleaned. The plan should state which items come off, which are covered, and which stay. Covering is cheaper than removing only where the fixing is sound; a bracket held by one rusted screw is better removed.
8. Where the water comes from and where it goes
A fixed wall task consumes more water than most kitchen managers expect, so the supply point and the route both need naming. A unit plumbed to a tap supply beside the line keeps hoses off a walkway; a mobile unit from the Cleaning Equipment Series suits sites where one crew cleans several rooms. On the drain side, run-off from a degreased wall is greasy water and belongs in the site's waste route through the grease interceptor. State who checks that interceptor before the task, because a full interceptor turns a compliant clean into a flooding incident.
9. Which mode for which deposit
Heat releases a polymerised film; pressure moves it; a rinse carries it off. A machine that switches between the two — a dry and wet steam cleaner — lets the crew put heat into the baked-on layer with the drier mode, then switch to the wetter mode to lift what has released. The specification on the Fixed Steam Cleaning Machine PowerDe HW02 page lists a 160 °C steam temperature, 0.8 MPa vapour pressure, a 6 kW heater and an 80 L SUS304 tank on a 220 V supply. That tank size is the figure that matters on a long wall: it decides how many breaks the crew takes to refill, and it is worth timing on a trial before the schedule is built around the task.
10. Chemical order and dwell, not chemical volume
Alkaline degreaser on a cold wall, left to act, then heat and pressure, then a clean-water rinse, gives a repeatable result. Steam onto an untreated thick deposit mostly redistributes it. Confirm the dwell time the detergent supplier states, the water temperature the detergent is rated for, and whether the two products are compatible at all — some surfactants break down when heated. Keep the chemical list on the plan short and the order of work fixed.
11. Ventilation, extraction and visibility during the task
Steam fills a kitchen quickly and it fogs the lights. With the extract hood running the crew loses sight of what they are doing; with it stopped the vapour has nowhere to go. Decide in advance what the extract system does during the window, and give the operator a route for the wand that keeps the hand and face out of the vapour column. Full sleeves, a visor and closed shoes are not optional kit on a wall task, because run-off falls from head height.
12. Adjacent food, packaging and dry goods
Vapour travels and settles. Before the machine is started, dry goods, packaging film, open cartons and open chemicals come out of the room or go under covers. Food-contact surfaces in the same room get their own cleaning step after the wall task, not before it, and the plan should say so. Sign the end of the line so nobody walks into a live wand.
13. Electrical equipment mounted on the wall
Control panels, thermostats, indicator lights, socket outlets and junction boxes on a tiled wall sit on the same plane as the deposit. They must be listed as wipe-around items on the task sheet, with the supply isolated where the enclosure is not rated for a washdown. Where a manufacturer has stated in writing that the enclosure must not be sprayed, put a copy of that statement in the plan rather than trusting a briefing.
14. Floor protection and the junction detail
Everything released from the wall ends up on the floor at the wall junction, in the skirting and in the cove. Protect the floor before work starts, and put the floor and the cove on the same task sheet as the wall. A clean wall over a greasy cove reads as an unfinished job to every inspector who walks past it, and the run-off will be counted as part of the wall task either way.
15. Acceptance criteria you can check without arguing
Write checks a crew can verify in seconds: no visible film at eye level on the tile face, joints uniform in colour with no dark band at the base, no emulsion left in the cove, no detergent odour on surfaces that touch food, no lifted or cracked tiles, and no water standing behind equipment. Add one reassembly check — every penetration sealed, every bracket fixed, every isolator back in service — and sign it against the task.
16. Drying before the line restarts
State how long the wall and the equipment around it must be dry before the kitchen is back in service, and how that is confirmed. Steam-based cleaning leaves far less free water on a surface than a hose wash, which is exactly why it suits a kitchen that cannot close the line all day. Time the drying on the first trial and put the number in the schedule instead of guessing it.
17. Records: before, after, and what was signed off
Photograph the worst area before the task and after it, date both, and keep them with the completed task sheet and the interceptor emptying records. Deep grease on walls, hoods and extract lines is a fire issue as much as a hygiene one, so the evidence of what was cleaned, when and to what standard is worth as much as the clean itself.
Confirm the wall, then confirm the machine
Once those seventeen points are answered, the equipment question gets much smaller: it comes down to supply point, drainage, the reach of the hose and the duty cycle, not to a catalogue. Shenzhen PowerDe Automation Precision Equipment publishes the parameters for each unit in its cleaning range, and customized cleaning equipment can be specified against a particular line layout and window. Send the wall survey — tile format, joint condition, penetration list, photographs of the worst deposit — to the contact page and ask for a method and a configuration matched to that kitchen.
