Which of the following services is part of the Express Detail?

The service that is part of the Express Detail is Quick Vinyl Protection. This service involves applying a protective treatment to vinyl surfaces, helping to restore their appearance and provide protection against UV damage and wear. Quick Vinyl Protection is designed to enhance the longevity of vinyl materials, making it a valuable addition to the Express Detail package, which focuses on efficient and effective treatments for vehicle interiors and exteriors.

The other options represent services that either fall outside the Express Detail framework or are not typically included in a quick detailing service. For instance, a basic wash only is a simpler, more foundational service without the added protections and details provided in Express Detail. Engine cleaning is generally a more thorough service requiring more time and labor, and exterior polishing is also a more detailed process aimed at enhancing the surface finish of the car, which exceeds the scope of a quick detail.