A cleaning trial that fails on site is almost never a machine failure. It is a fixture that arrived in the wrong condition, a trial area that was not representative, or nobody on the shop floor who could say what the deposit actually is. Fixtures — jigs, holders, plates, mandrels, conveyance parts, tooling that carries the product — are the hard case in industrial cleaning because they combine complex geometry, close tolerances and a deposit that has been building between regrinds. Preparing them properly is the difference between a trial that answers the question and one that costs a week.
Select fixtures that represent the real problem
Do not send the cleanest part in the tool crib. Pick parts at three stages of their life: one with light deposit from a short run, one at the point where it would normally be taken out of service, and one that has been left too long because nobody had time. Note for each how it was used, what process produced the deposit, what it contacts, and what tolerance or surface finish has to survive the clean.
That last line is the one buyers forget to state. A fixture that comes back clean but with a located face changed by a few microns is a failed clean, and nobody will agree on that afterwards unless it was agreed before.
Record the condition before anything happens to it
- Photograph each fixture from several angles, including the recesses and the underside, with a scale in the frame.
- Measure and record the features that matter: datum faces, bore diameters, seating surfaces, thread condition. Numbers you do not take before the trial cannot be recovered afterwards.
- Describe the deposit in words and, where possible, identify its origin — cutting fluid, way oil, graphite, coolant residue, burnt lubricant, sweld spatter. Guessing at the soil is what produces the wrong method.
- Mark any existing damage, so a trial cannot be blamed for a crack that was already there.
Handle and ship them so the deposit survives
A fixture that is wrapped in cloth and transported in an open truck bed arrives with the loose fraction gone and the rest smeared. Bag parts individually, keep loose abrasive and chips where they are, and note anything you know has been lost in transit. If the trial is on your own line, isolate the fixture at the machine and move it directly to the cleaning position rather than routing it through a wash bay first — pre-cleaning is the most common way a trial is accidentally run on the wrong evidence.
Define what "clean" means before the trial starts
Write the acceptance criterion down: what must be removed, from which surfaces, and what may remain. State what must not be affected — coatings, markings, fit surfaces, seals on an assembly. Agree how the check will be made: visual against the photographs, a wipe test, a solvent wipe for residue, a dimensional re-check on the features recorded earlier.
Heat-based cleaning is usually proposed for oily deposits on steel fixtures, because heat releases grease and does it with little water, which matters where there is no drain and no drying capacity. Where the supplier's numbers are used for comparison, note that the 6 kW, 220 V unit in PowerDe's cleaning range — the Fixed Steam Cleaning Machine PowerDe HW02, listed with an 80 L SUS304 tank and 0.8 MPa vapour pressure — is positioned on its page around vehicle cleaning rather than tooling, so its specification is a reference point for a fixed steam duty rather than a recommendation for fixtures. Model naming around the 220 V fixed units is inconsistent on the customer's own site, so confirm the exact model and parameters in writing.
Keep a person on the trial, and write the four numbers down
One of your own staff should watch the whole clean and record passes needed, time taken, water consumed, and what had to be done by hand afterwards. Then re-measure the recorded features and compare against the before photographs. Those four numbers plus a dimensional check are what convert a demonstration into a cleaning specification you can apply to the rest of the tool crib.
A fixture trial is worth doing precisely because the preparation is transferable: the same records, the same deposit descriptions and the same acceptance tests become the standard for every cleaning decision after it. Ask the supplier to put the resulting method — mode, dwell, distance from the surface, what may not be cleaned — into the quotation, so the trial's outcome survives the purchase.
