Three soils turn up on almost every concrete floor in an assembly or stamping plant, and they are usually treated as one problem called “the floor is dirty”. They are not one problem. Way oil and hydraulic oil behave one way. Water-miscible coolant behaves the opposite way. Metal fines are not a chemistry problem at all. Choose one industrial concrete floor degreaser, run one procedure against all three, and you will get a floor that looks better for an hour and then films back over.
This is a soil-led guide rather than a floor-cleaner roundup. If you want the choice organised by facility type, that is the floor cleaning chemicals guide for distribution centers and warehouses. If your question is really about the machine — foam in the recovery tank, streaking behind the squeegee — that is the auto scrubber chemical guide. This post is about what is on the concrete in a plant that machines, stamps or assembles metal, and how to get it off.
Concrete is porous. Even a hard-troweled slab has a capillary structure, and a slab that has been under forklift traffic for fifteen years has an open, worn surface with a network of micro-cracks. Oil does not sit on that surface waiting to be mopped; it wicks in, and once it is below the surface it is a reservoir that keeps feeding the top back up. That is the mechanism behind the complaint that a floor “gets greasy again by Thursday” — the last clean removed the oil on the surface and none of the oil in the slab.
Two consequences worth knowing before you choose anything:
Sealed, coated or densified slabs behave differently — the soil stays on top, which makes it easier to remove and easier to spread. On a sealed floor the priority shifts to rinsability and non-dulling behaviour, because residue and haze show on a finished surface in a way they never do on bare concrete.
This is straight oily soil — way oil, hydraulic fluid, gearbox drips, drawing compound tracked out of the press area, plus the grey-black traffic film that forms when any of that bonds with airborne dust and tyre rubber. It is what most people mean by a greasy floor, and it is the soil most responsive to correct chemistry.
What it needs is a degreaser that penetrates the film, emulsifies the oil into the wash water and then holds it in suspension so it leaves with the recovery rather than smearing across the slab. That last property is the one plants underrate. A product that breaks the oil but drops it again as the solution cools produces the classic outcome of a floor that is uniformly slightly greasy instead of patchily very greasy.
For the heaviest of this work, Stealth is IRC’s aggressive option: a highly alkaline, super-concentrated, water-based industrial degreaser and emulsifier at pH 13.0 in a 1% solution, described as suspending soil and rinsing completely and freely. The suspension and free-rinsing behaviour are why it belongs on this soil specifically. Where the floor is finished or coated and dulling is a concern, Power 7 is the heavy-duty degreaser that stays free-rinsing and non-dulling even on finished floors, is highly dilutable so one drum covers the press bay and the aisle at different strengths, and works well under hard water conditions.
If you want the general framework for matching a degreaser to a soil before you get to floors at all, it is set out in industrial degreaser selection.
Water-miscible metalworking fluid — soluble oil, semi-synthetic, synthetic — is the soil that catches plants out, because it arrives on the floor already emulsified. It contains its own surfactants and corrosion inhibitors, put there deliberately so that oil and water stay mixed. On the floor those same surfactants keep working: the fluid spreads into a thin, wide, slick film instead of a discrete puddle, it re-wets whenever the floor is mopped, and it will happily re-emulsify into your wash water and be redistributed rather than removed.
Three practical differences follow:
Where hard water is in play, coolant residue and hardness minerals combine into a film that resists a weakly matched cleaner. Optima is the relevant choice there: IRC describes it as a highly alkaline synthetic caustic builder specifically designed for controlling water hardness conditions, NSF-rated, HMIS 0-0-0, pH 10.5 in a 1% solution, medium-to-low foaming and free rinsing. Medium-to-low foam is not a footnote on a plant floor — it is what lets the same product be used in a machine without fighting the recovery tank.
Fines are the ferrous and aluminum particulate that leaves a stamping press, a grinder or a machining cell as dust and swarf, gets tracked into aisles on wheels and boots, and settles into the pores and micro-cracks of the slab. They are the reason a floor can be chemically clean and still look and feel dirty.
Three things fines do that oil does not:
The fix is mechanical and it happens before any chemistry: sweep or vacuum, and use a magnetic sweeper on ferrous fines in the traffic paths out of the press and machining areas. A plant that puts a magnetic sweep ahead of the wet clean gets a visibly better result from the same degreaser, because the chemistry is no longer being spent on suspending grit. A plant that skips it is pushing an abrasive slurry around with an expensive machine.
Where aluminum is what you are stamping or machining, the compatibility question moves to the front. Optima Prime is IRC’s controlled-alkaline product built for that case. It is completely safe for soft metals and aluminum, with corrosion inhibitors and increased wetting agents, at pH 11.2 in a 1% solution. The floor itself does not care, but aluminum swarf, aluminum fixturing, and machine bases and guarding adjacent to the floor do, and a strongly alkaline product in a fine mist or an overspray does reach them.
Order matters more than product choice here. In sequence:
Consistency across shifts is the other half. Hand-mixing in a plant with three shifts and multiple fill points produces three different cleaning programs. On a floor the penalty is invisible until the film comes back. The Hi-Flow dispenser dispenses at 14 GPM and exists for filling auto scrubbers without anyone deciding a ratio by eye. The Fusion Pro Four handles up to four chemicals with one side rated for mop buckets and scrubbers. The other for bottles, which suits a plant running a heavy degreaser, a maintenance cleaner and a soft-metal-safe option from the same station. Why that pays for itself is the argument in dilution control systems.
Plants that get this right stop looking for a single answer. A worked example of how the zones usually fall out:
| Zone | Dominant soil | What to run | Why |
| Press and machining bays | Heavy oil, drawing compound, oil-wetted fines | Stealth at the strong end of its range | Aggressive degreasing and soil suspension where the load is worst |
| Coolant-affected floor around machining cells | Emulsified coolant, tramp oil, hardness film | Optima | Built for hard water conditions, medium-to-low foam for machine use, free rinsing |
| Aluminum stamping and machining, and floor adjacent to soft-metal equipment | Oil plus aluminum fines | Optima Prime | Aluminum safe by design, corrosion inhibited, still a controlled alkaline clean |
| Assembly aisles, sealed or coated floors, mixed light soil | Traffic film, tracked residue | Power 7 | Free-rinsing and non-dulling on finished floors, highly dilutable, hard-water tolerant |
| Offices, corridors, break areas on the same route | Light general soil | A neutral maintenance cleaner such as Caliber | No reason to put an alkaline degreaser where there is no oil |
Then write it down at the fill point. A zone map with a product and a ratio next to each area is what survives a shift change; a preference in someone’s head is not. The plant-wide version of this — soils, surfaces and what removes them across equipment as well as floors — is in cleaning solutions for OEM assembly and stamping plants, and the full range sits under OEM and tiered suppliers.
The one matched to the dominant soil in that zone. For heavy oil and drawing compound, an aggressive highly alkaline degreaser that emulsifies and suspends soil. Coolant films in a hard-water plant, a product formulated to control hardness with a low foam profile so it can be used in a scrubber. For floors adjacent to aluminum or soft metals, a controlled-alkaline, aluminum-safe product. Most plants need two or three, zoned — not one product used everywhere.
Mechanically, and before any chemistry. Sweep or vacuum, then run a magnetic sweeper over the traffic paths out of press and machining areas to lift ferrous particulate. Fines hold oil, abrade the floor and pads under traffic, and rust-stain damp concrete. A degreaser applied over loose fines is spent suspending grit, and the scrubber turns the mix into an abrasive slurry.
No. Acids do not lift oil, and they etch the cement paste, which opens the porosity and makes the slab absorb the next spill more deeply. Oily soil on concrete is an alkaline degreasing job. Acidic products have their uses on concrete — mineral scale, some efflorescence — but chasing an oil stain with one leaves the floor less able to resist oil than before.
Sweep and magnet-sweep before you wet the floor. Match the product to the zone, not the building. Extend coverage past the visible edge of a coolant film. Let it dwell, agitate, and recover the solution while the soil is still in it. Keep acids away from oil on concrete. And fix the ratio at the fill point so the program does not change with the shift.
If your floor is coming back faster than the schedule says it should, the useful next step is someone standing on it. Schedule an on-site demo and we will map the zones and the soils with you.
