Crime Scene Cleaner

Your work tool is a mop and a brush ... and maybe a bottle of acid.
Clean up the crime scene and obliterate all traces of crime.
-wipe blood off the walls and floor
-clean up parts of the bodies
-hide the murder weapon
-clean the scales
-remove the fingerprints
-patch the holes from the shells on the walls
-repair/replace damaged equipment
At the end you'll get information if you managed to deceive the police.