Definition of cleans:
(adj) :
Free of dirt, filth, or impurities (extraneous matter); not dirty, filthy, or soiled.
(adj) :
(of metal) Having relatively few impurities.
(adj) :
Free of contamination, (unwanted) germs, infection, or disease.
(adj) :
Devoid of sexually transmitted diseases (STDs).
(adj) :
Free of imperfections, blemishes, or defects.
(adj) :
(sports, for example, professional wrestling, slang) Of a victory or performance: without any blemishes such as submission holds, disqualification, interference, etc.