A premium car wash boasting first-in-the-region amenities opened this weekend in Mariemont. Carriage House Car Wash opened Saturday at 7489 Wooster Pike. The 24-hour car wash features a natural light-filled car wash tunnel and a drive-on conveyor belt to replace the typical rollers found at other car washes. Carriage House is also the first in the region to offer license plate scanning for its monthly wash members.