The house had huge, spotlessly clean rooms.

那房子里有着宽敞而且一尘不染的房间。

The subway is efficient and spotlessly clean.

地铁快，而且一尘不染。

The apparatus is spotlessly clean.

仪器上一尘不染。

The centre of the city is spotlessly [stainlessly] clean.

市中心一尘不染干干净净。

The room was spotlessly clean.

房间干净的一尘不染。