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Aviation-qualified products or automotive products: only one belongs on an airframe

Name: JetRefined
Address: Atlanta, GA, US
Telephone: (770) 999-9740
Price range: $$$

Use aviation-qualified products. There is no second option here, and this is the only comparison on this site where we will say that. Aviation qualification is not a badge, it is a battery of tests for failure modes a car does not have: sandwich corrosion between faying aluminium surfaces, hydrogen embrittlement of cadmium-plated parts held at load, acrylic crazing, paint softening. A consumer product has not failed those tests. It was never submitted to them.

The short answer

Aviation-qualified products, without exception. This is the one comparison on this site with no legitimate second option: an automotive product on an airframe is not a cheaper version of the same thing, it is a different product that was never tested for the job at all.

compared with
	OEM-approved and aviation-qualified products	General-purpose or automotive products
How it qualifies	Tested against airframe standards: seven days of sandwich corrosion between faying aluminium panels, a hydrogen embrittlement test to ASTM F519 with four notched cadmium-plated specimens immersed for 150 hours at 45 per cent of load, acrylic crazing, immersion corrosion, paint softening.	Tested for cleaning and finish performance on the materials a car is built from. Never submitted to a single airframe test, because it was never sold for one.
Method	The product is chosen per material. Paint, acrylic, alclad, plated metal, urethane-finished veneer, stone, leather and certified carpet each get their own chemistry and their own procedure.	One bottle across several surfaces, on the unstated assumption that an aircraft is a large car. It is not, and the differences are structural.
Durability of the result	The finish holds because nothing in the chemistry works against the substrate. Repeat treatment over years accumulates no damage.	Looks right on the day. What it leaves behind surfaces months later as residue, hazing, softened paint or crazed acrylic, long after anyone connects the two.
Risk	Known and bounded. The failure modes have been tested for, documented and published on a technical data sheet you can ask to read.	Unbounded and invisible. Wicking into a lap joint, sitting in a fastener recess or resting against a cadmium-plated part is precisely what was never tested.
Downtime	None beyond the work itself.	None on the day. The repair is what grounds the aircraft: an acrylic pane, cabin woodwork back to a completion shop, carpet replaced rather than cleaned, or paint.
What it does to resale	A maintained finish, clean records and nothing on a pre-purchase inspection that needs explaining.	A buyer sees hazed cabin windows, dulled plating or a wood finish that can no longer be repaired. It reads as neglect, and it is priced as neglect.
What the cost covers	The qualification itself: test programs that cost money to run and to hold, and procedures that treat each material as its own problem. Nothing has to be redone.	A cleaning product, priced as one, because that is what it is. It carries no airframe test data, so what it may do to a joint, a plating or a pane sits outside the price and is settled later, at a maintenance rate.

What aviation qualification actually tests

SAE AMS 1526 is the specification for cleaners used on aircraft exterior surfaces: a qualified product must cause no corrosion to aluminium, magnesium or steel alloys, and must not adversely affect acrylic glazing or painted and unpainted surfaces. Boeing D6-17487, which governs exterior and general cleaners along with liquid waxes, polishes and polishing compounds, goes further. Its battery includes a seven-day sandwich corrosion test with product-saturated filter paper held between faying aluminium surfaces through humidity and heat cycling, a hydrogen embrittlement test to ASTM F519 in which four notched cadmium-plated specimens sit immersed at 45 per cent of load for 150 hours, an acrylic crazing test, immersion corrosion and paint softening.

None of those tests asks whether it cleans

They ask what the product does afterwards, once it has run into a lap joint you cannot see, wicked into a fastener recess, or sat against a cadmium-plated fitting under load. That is the whole difference. A car has no faying aluminium surfaces holding a fuselage together, no cadmium-plated high-strength steel in tension, no acrylic glazing, and no consequence if a residue takes eighteen months to show itself. A consumer product has not failed these tests. It was never submitted to them, and that gap is being read as a pass when it is not one.

Inside the cabin, the same rule applies

Cabin glazing is usually acrylic, and acrylic is why the airframe standards carry a dedicated crazing test at all: a cleaner that is harmless on toughened automotive glass is not automatically harmless on it, and crazing is damage inside the pane rather than film on it. Gulfstream's completion center maintenance handbook, chapter 12-26-00, names silicone-based polish, Pledge included, as leaving an oily residue on the urethane wood finish that can prevent that woodwork being repaired later, and tells you to clean the wood before every third polish rather than let residue build. Carpet spotters containing trichloroethylene or MEK are prohibited outright. Aggressive cleaning of seat coverings and carpet, and beater-bar vacuuming, can remove the fire retardant the material was certified with, which on transport-category aircraft is 14 CFR 25.853, and heat-drying carpet above 100°F shrinks it. Do not mix ammonia and chlorine bleach, and do not take bleach aboard at all.

The failure mode is that it works, and then it does not

Nobody substitutes a car product out of carelessness. It happens because someone competent and well-meaning has a product that performs beautifully on a car, the aircraft looks excellent when they are finished, and there is no feedback loop. The damage is slow and it is deferred. Filiform corrosion creeps under paint. Acrylic crazes. Plating dulls. A veneer panel refuses to take a repair. By the time any of it is visible the bottle is long gone, nobody links the two, and the aircraft is simply described as having aged badly for its hours.

What actually changes the answer

Not the aircraft, and not the budget. What changes is which qualified product, and that is a real decision. Where the airframe or completion manual names a product or a procedure for a specific material, follow it over any generic aviation product, because that manual was written by the people who installed the material. Note also that the aisle a product is sold in decides nothing. Some products sold into both markets do hold genuine airframe qualifications; the qualification is the test, not the marketing. Ask which standard, by number, ask for the data sheet, and ask before the bottle is opened rather than after.

Why the qualified route costs more, and why we do not move on it

Qualified chemistry costs more per litre, the procedures are slower because each material is treated as its own problem, and the testing behind the product is expensive to run and to hold. That is the whole of the premium. Set it against what redoing the work costs: a crazed acrylic pane is a maintenance item, not a cleaning one; a cabin veneer panel that will not take a repair goes back to a completion shop; carpet that has lost its fire retardant is replaced rather than cleaned; paint damage ends in a strip and repaint, which is typically five to seven weeks on the ground. None of those is recoverable with a better product next time.

Choose when

Always. Every airframe, every surface, every visit, whether the work is a trip-ready wipe-down between legs or a full interior and exterior. There is no aircraft type, no budget and no deadline that makes an unqualified product the correct choice, and the fact that a job looks perfect on completion tells you nothing about what the chemistry is doing eighteen months later.

Choose when

On the tug, the ground power unit, the hangar floor, the toolbox and the crew car. These are genuinely excellent products, which is exactly why the substitution happens: they were engineered properly for a domain that has no faying aluminium joints, no cadmium plating in tension, no acrylic glazing and no certified fire-retardant textiles. Keep them, use them, and keep them off the aircraft.

Questions we get on this

Can I use a car quick-detailer on the aircraft between trips?: No. Use what the airframe or completion manual specifies for that surface. If nothing qualified is aboard, leave the surface alone: dragging a cloth over dry grit has its own cost, and dust before a leg is a smaller problem than a residue in a joint or a scratch pattern in the clearcoat.
How do I check that a product is actually qualified?: Ask the vendor which standard it holds, by number, and ask for the technical data sheet. A qualified product's manufacturer publishes both. Then cross-check the material against the airframe or completion manual. If a vendor cannot answer that question in front of the aircraft, the answer is no.
The glass cleaner in the FBO cupboard is fine, surely?: Only if the label says it is safe on acrylic. Cabin glazing is usually acrylic rather than glass, and the airframe standards carry a crazing test precisely because the wrong chemistry crazes it. Crazing is damage in the pane, not film on it. Flood the surface, lift the grit away, then a clean microfibre. Never dry-rub.
Someone has already used the wrong product. What now?: Tell maintenance, and write down exactly what was used and where. Do not chase it with a second chemical, which is how most secondary damage happens. Silicone on cabin wood and an unknown cleaner on acrylic both need assessing by someone who can see the surface, not treating blind.
Does aviation-qualified chemistry cost more?: Yes, per visit. The premium is the testing behind the product and procedures that treat each material separately. Set it against the alternative bill: a crazed pane handled by maintenance, a veneer panel refinished at a completion shop, or a strip and repaint measured in weeks on the ground.

Send us the tail number and the airport and we will tell you exactly what goes on your aircraft, surface by surface, and what each product is qualified against, before anyone opens a bottle. If a previous vendor has used something you are unsure about, say so and we will look at it first.

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Other decisions

vs Dry wash between trips, wet wash when the soil load is heavier than film. Neither one substitutes for the other, and that line is drawn by what each method removes, not by preference. vs Rinse-less, unless the ramp allows no water or the airframe carries nothing more than a dusting. It takes a wider band of soil and it is the gentler of the two when it is done to method. Dry wash is the right answer inside its limits and a poor one outside them. vs Coat paint you intend to keep. On paint already booked for the shop, wash it correctly instead and coat the new finish while it is perfect. vs Correct the paint only when the gauge shows the film can afford it; if a repaint is within a year or two, or the paint has already been polished more than once, live with the defects and protect what is left. vs Correct while the film is sound. Once the clearcoat itself is failing, polish is a delaying tactic and the repaint is the job you are actually buying. vs Maintenance is how you reach the repaint interval in good condition, not how you avoid it. If the paint is due, paint it.

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