On this page of our guide to Wolfenstein: Youngblood you will find a detailed description of Investigation Cleanup side mission. This task concerns a search for clues and evidence in the Brother 3 district. All found documents need to be destroyed. In addition, it requires the murder of a Nazi investigator and the destruction of sewers.
Who's commissioning the mission: Talk to Maria Laurent in a hiding place in the catacombs.
This task takes place in Brother 3 district where you could have unlocked a fast travel point (subway) - see separate pages of our guide for more information. When you reach this district, set the mission as active and follow the instructions on the mini-map.
There are 3 sets of documents to find and you will find them all on your way to the main part of the enemy base. The first set of documents is in the security booth shown in the picture. You can destroy documents in any way you like, e.g. with any firearm.
The second set of documents can be found after passing through the part of the ruins where Zitadelle is patrolling. All battles in this mission are optional. If you don't feel like rolling them down, you can sneak a lot or run away from your opponents.
You will find the third set of documents when you reach the next location in the ruins, which is separated by a yellow gate suitable for lifting. It's a research station next to a damaged railing.
Another objective of the mission is the murder of an investigator. He is in the upper part of the ruins and you can also meet ordinary soldiers and Supersoldats nearby. The investigator himself uses a shield marked with "vertical" rectangles, so make sure you choose the right weapon to deal with him faster.
The last goal of the mission is to destroy sewers with backups. They are a little further away in a dimly lit room - just shoot them with any weapon. Destroying the terminal will complete the mission immediately.
Rewards: 12700 XP, 635 silver coins, 1 skill point.