The Vietnamese word "sành sanh" is an informal expression that means "very clean" or "spotless." It is often used to describe something that is not only clean but also looks fresh and appealing.
Mặt bàn này sành sanh quá!
(This table is so clean!)
Căn phòng sau khi dọn dẹp trông thật sành sanh.
(The room looks really spotless after cleaning.)