The belly collects oil, exhaust, hydraulic film, and grime that plain washing never touches. Proper belly degreasing protects both appearance and the ability to spot leaks.
The underside of an aircraft is the dirtiest area by far. Exhaust soot streams back from the stacks and bakes onto the paint, engine oil and hydraulic fluid weep and get blown aft, and general environmental grime accumulates. Over time this forms a stubborn, sometimes greasy film that ordinary washing cannot remove and that only gets harder to clean the longer it sits.
A clean belly is not just about appearance. A degreased underside makes it far easier to spot new oil or hydraulic leaks during preflight and maintenance — a fresh weep stands out against clean paint but disappears into an already-filthy belly. Baked-on exhaust and oil can also hold moisture and contaminants against the paint, working against the finish over time.
Belly degreasing requires the right chemistry and technique. We use aircraft-safe degreasers appropriate to the contamination, applied and agitated carefully to break down baked-on soot and oil, then thoroughly rinsed so nothing is left in seams, gear wells, or around fittings. Aggressive or improper solvents can harm paint, seals, and polished metal, so this is precision work — not a pressure-wash-and-hope job.
Belly degreasing pairs naturally with a full exterior detail. A gleaming top and sides over a filthy belly is an incomplete job. We integrate degreasing with the wash, brightwork, and correction so the entire aircraft — top to bottom — presents at one consistent standard. For turboprops and jets especially, a clean belly dramatically elevates the overall presentation.
We perform belly degreasing on-site at San Jose (KSJC), San Carlos (KSQL), Livermore (KLVK), Hayward (KHWD), Concord (KCCR), Napa (KAPC), and other Bay Area airports, with proper containment and cleanup so your hangar or ramp space is left clean.
Questions
It depends on the aircraft and how much it flies, but many owners include belly degreasing with each major detail or at least seasonally. High-utilization and turboprop/jet aircraft benefit from more frequent attention because exhaust and oil accumulate quickly.
Not when done properly. We use aircraft-safe products and careful technique around antennas, static ports, drains, and fittings. Improper solvents and careless pressure washing are what cause damage — which is exactly why this should be done by someone who details aircraft specifically.
Yes. A degreased belly makes fresh oil and hydraulic weeps immediately visible, which helps you and your mechanic catch developing issues early. On a grimy belly, a new leak simply blends in.
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