Operators comparing kitchen exhaust duct grease cleaning options usually discover that the real choice is not one method against another, but a match between method and soil. Grease in a hood, filter or duct is not dust. It is cooked oil that has cooled into a film, and the cleaning method has to break that film, move it off the surface, and then leave the metal dry enough to go back into service. On that basis, four approaches dominate the market, and each one earns its place in a different situation.
The soil decides the shortlist before the equipment does
Light, recent grease that has not been baked on can be handled by manual wiping with a degreaser. Once heat has cured the deposit, scrubbing stops removing the film and only moves it around. That is the dividing line most operators miss. A method that works well on a daily-wiped filter will fail on a duct that has been left for a year. Before comparing machines, it is worth writing down three facts about the job: how thick the deposit is, how long it has been in place, and how much of the surface can physically be reached.
Manual scraping and chemical degreasers
Manual work is the cheapest entry point and the least predictable result. A crew with scrapers, brushes and a spray degreaser needs no capital outlay, and for small, accessible parts it is a sensible choice. The limits are labour time, consistency and residue. Alkaline degreasers have to sit on the surface to work, then be rinsed off completely, and any solution left behind can taint the next cooking session. In a duct, rinsing is the hard part: the geometry traps both the loosened grease and the chemical.
- Best fit: removable filters, housings, and surfaces a person can stand in front of.
- Weak fit: long duct runs, fans, and any internal surface without access panels.
- Real cost driver: crew hours, dwell time, and rinse water.
High-pressure water washing
A cold or warm pressure washer has real force, and force does remove loose and semi-cured grease. The problem is that force alone does not separate cooked oil from steel. Without heat, the operator compensates with more passes, more chemical, or both. Pressure washing also floods the work area. In a kitchen, that means water running across a working floor, into electrical fittings, and into the very duct that now has to dry before the extraction system can be restarted. Downtime is often longer than the cleaning itself.
Steam cleaning: what makes it different
Steam works on the deposit rather than against it. A commercial steam cleaning equipment unit generates steam hot enough to soften and lift baked-on grease, so the film releases instead of being abraded away. The Fixed Steam Cleaning Machine PowerDe HW02, for example, is specified on its product page with 6 kW heating power, 160 °C steam temperature and 0.8 MPa vapour pressure, with an 80 L SUS304 tank and a switch between dry and wet steam. Those figures describe a machine built for heavy deposits, and the dry/wet switch matters operationally: wet steam carries the heat into the grease, while dry steam finishes the surface with far less free water.
The water use is the other practical difference. Steam is mostly energy, not volume. Low-water steam cleaning means the surface comes back nearly dry, so extraction can be brought back into service quickly instead of waiting for a flooded duct to drain. Where an operator is choosing central kitchen degreasing equipment for a site that cannot afford a long shutdown, that drying behaviour is often the deciding factor rather than the cleaning result itself, because all the candidate methods can clean an accessible surface given enough time.
- Best fit: heavy, heat-cured grease on hoods, filters, baffles, fans and accessible duct sections.
- Second strength: sites with limited shutdown windows and limited floor drainage.
- Watch point: the machine needs a 220 V supply and a water inlet, so plan the utility connection before the job.
Off-site and robotic duct cleaning
Contract duct cleaning with robotic heads or full disassembly reaches geometry nobody can clean by hand, and for a deeply contaminated run there is no substitute. What it does not offer is frequency. Because the equipment and crew have to be mobilised, the work is scheduled occasionally rather than weekly, and contamination builds between visits. Many operators land on a hybrid: contracted deep cleaning of the full duct run on a planned cycle, plus in-house steam cleaning of hoods, filters and accessible sections between those visits.
A comparison operators can run on their own site
Do not compare methods on paper. Run the same soil through two methods on the same kind of surface and measure the things that cost money.
- Mark a test panel or a single filter section, photograph it, and clean it with each method.
- Time the whole job, including setup, dwell, rinse and drying — not just the passes with the tool.
- Count labour hours and measure water use, including what the site has to mop up afterwards.
- Log any chemical used, and whether rinsing left residue behind.
- Record how long the extraction system stayed out of service, from the first pass to restart.
Questions to put to any supplier
Equipment claims are easy to make and hard to compare. Ask for the numbers that govern a real job: steam temperature and pressure at the nozzle, heating power, tank volume and how long a full tank supports continuous work, whether the machine offers both dry and wet steam, and what supply — voltage and water — it needs on site. For a fixed installation, confirm that the 220V steam cleaning machine can be sited where the work actually happens, with drainage and power within reach. If the site also cleans delivery vans or service vehicles used by the catering operation, check whether the same PowerDe cleaning equipment platform covers that duty as well, instead of buying a second machine.
On the question in the title, the honest answer is narrow. Steam is not a universal replacement for manual work on small removable parts, and it is not a replacement for robotic access to deep duct runs. Where the soil is heat-cured grease on surfaces the team can reach, it wins on cycle time, water and shutdown, and that is exactly the duty that recurs most often in a working kitchen.
