Add-on services can increase the final price because extras like engine bay cleaning, headlight restoration

https://www.scribd.com/document/1056606631/Full-Auto-Detail-Cost-Explained-What-You-Get-in-a-Complete-Car-Detailing-Package-131773

Add-on services can increase the final price because extras like engine bay cleaning, headlight restoration, odor removal, or fabric protection go beyond a standard interior or exterior package.