SeJin

SeJin (세진사, 'People Serious About Car Washing') is a Seoul, South Korea-based on-demand mobile car wash service founded in June 2023. The company operates through a consumer app that lets customers book contactless car washes performed by vetted professional crews at their home or office parking lots, primarily between 8pm and 2am to minimize disruption. Customers leave their car key in a secure key box, and SeJin's certified crew (called 'crew') performs a rinse-less, waterless wash using premium US-made polymer-based cleaning agents without fire hazard risk. After the wash, customers receive a diagnostic report on their vehicle's condition. The company launched its customer app in August 2023 and raised 1.5 billion KRW in seed funding in December 2023. By February 2026 the platform had surpassed 40,000 cumulative washes since launch, expanding from residential apartment complexes to commercial office buildings and adding daytime service hours.