clean slate

:  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 piece of construction material (such as laminated rock) prepared as a shingle for roofing and siding

:  a dense fine-grained metamorphic rock produced by the compression of various sediments (such as clay or shale) so as to develop a characteristic cleavage

:  a tablet (as of slate) used for writing on

:  to cover with slate or a slatelike substance

:  to designate for a specified purpose or action :  schedule

:  to thrash or pummel severely

:  to criticize or censure severely