The Cleaner

The Cleaner is a miscellaneous quest in Fallout 4. It can be started by choosing the Barter option from Whitechapel Charlie in The Third Rail, in Goodneighbor. No purchase is required after selecting the Barter option.

Detailed walkthrough

 * 1) Enter the Third Rail in Goodneighbor and find Whitechapel Charlie.
 * 2) Enter the Barter menu with Whitechapel Charlie. He will initiate a conversation with the Sole Survivor about needing someone for a job. The job is to kill the Triggermen inside the Goodneighbor warehouses. Accept the quest.
 * 3) * (Optional) Pass one or more persuasion/intimidation checks for more caps reward.
 * 4) Navigate through Goodneighbor to find the 3 warehouses. The doors will be Novice locked.
 * 5) After gaining entry into the warehouses, kill all the Triggermen residing inside.
 * 6) Return to Whitechapel Charlie for a reward of 200 caps, or up to 400 if one passed the persuasion checks.

Bugs
The quest can be open and set as active with no quest markers up after you kill all of the quest marked Triggermen. You may have to go back through the warehouses and find the unmarked Triggerman/men to kill or you may have to kill some Triggermen in alleyways in order to complete the quest. If you don't, Charlie won't have any conversation options about the quest and it will stay in your list of active quests.