A specialized person who removes incriminating evidence from a crimescene (usually one involving murder) in order to make the legal consequences of the crime go away.
Cleaners
will get rid of evidence
like bodies, blood, weapons, fingerprints, and even witnesses in order to hide the proof or notion of the crime -- or, they
will 'dress up' the crimescene to mislead authorities. For example, they could make it appear
like a break-in gone bad, an act of self defense, a fire, etc.
The cleaner used
bleach to remove the the blood stains from the carpet, and although this would still leave DNA evidence, one could always claim that the victim once had a
nose blead there... a very very massive
nose blead!