clean sheet

: free from dirt or pollution

: free from contamination or disease

: free or relatively free from radioactivity

: so as to clean

: in a clean manner

: all the way : completely

: to make clean: such as

: to rid of dirt, impurities, or extraneous matter

: to rid of corruption

: an act of cleaning dirt especially from the surface of something

: a broad piece of cloth

: sail

: a usually rectangular piece of paper

: rolled or spread out in a sheet

: of, relating to, or concerned with the making of sheet metal

: to cover with a sheet

: to furnish with sheets

: to form into sheets

: a rope or chain that regulates the angle at which a sail is set in relation to the wind

: the spaces at either end of an open boat not occupied by thwarts : foresheets and stern sheets together

: to move or set (a sail) by manipulation of a sheet