1.   He smelt clean and I shut my eyes.

2.   He smelled clean.

3.   It smells clean, which is normally a good thing, but a beach needs to smell like a beach.

4.   She remembers how clean it smelled.

5.   The air smells clean and the ocean is as clear as glass.

6.   The floor can be filthy, the vending machines rusty and the communal rolling baskets rickety with age, but the place smells clean.

7.   They tell how, when Anna Rogers lived there, the place always smelled particularly clean and sweet, with the old-fashioned scent of beeswax polish in the air.