Besides the soap, FAA auditors say they saw Spirit mechanics use a hotel key card to check a door seal.
In March, The Times reported that Federal Aviation Administration's (FAA) auditors saw Spirit AeroSystems' mechanics applying soap to a door seal.
AdvertisementAccording to Buccino, Spirit also tried using other household products such as Vaseline, cornstarch, and talcum powder as a lubricant before settling on liquid Dawn soap.
Buccino said the Dawn soap became their top choice because it didn't cause the door seal to degrade over time.
Representatives for Boeing, Spirit, and the FAA did not immediately respond to a request for comment from Business Insider sent outside regular business hours.
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Spirit AeroSystems, —, Joe Buccino, Buccino, Spirit, Sean Black, Black, Dave Calhoun, Jennifer Homendy
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Boeing, Spirit, FAA, Service, New York Times, The Times, Aviation, Times, Alaska Airlines, National Transportation Safety Board, NTSB, Business Insider