How to wash the engine bay on a 2019-2023 GMC Sierra or Chevy Silverado. Same process for most any vehicle. A little more care is needed on cap & rotor style ignition systems or vehicles with deep spark plug boots, but not much to it on the GM V8's. Yukon, Tahoe, Suburban. 2019, 2020, 2021, 2022, 2023.