It’s as clean as a whistle.
It’s so clean you could eat off the floor.
It’s spic and span.
Clean your room.
Pick up your clothes.
I want you to pick up your room.
I want this place spotless.
Pick up after yourself.
Were you raised in a barn?
You live like a pig!
A place for everything, and everything in its place. (cliché)
Cleanliness is next to godliness. (cliché)