Crime Scene Cleaner Walkthrough Guide: All Tape Locations, Secrets, and 100% Level Completion

Mateo's Pizzeria
Before heading out on the mission, be sure to upgrade the capacity of the trash bin. There will be a huge number of broken tables on the level, which will save you a lot of time. You can also take a ladder for easy access to the secret room.
Head to the main hall, set up an ozone generator in the center of the room, and collect the trash. Large pieces of the table can be quickly broken with an axe or by hand. Clear a path to the bathroom so you can safely change the water. Set aside the found metal trays in the hallway so you don't lose them. Later, they can be placed on the shelf opposite the oven.
In the bathroom, pick up clue No. 1 — MAC-10. Clean the toilet stalls. You can now stack chairs here so they don't interfere with cleaning the main hall. Reach the administrator's desk. On the table, there will be clue No. 2 — note, and in the right drawer, an unknown key. On the floor near the corpse lies clue No. 3 — frying pan.
After cleaning this area, pick up the key to the cold storage in the oven. Continue clearing the hall until you find clue No. 4 — phone under the corpse. Finish cleaning the room, then all that's left is to place all the chairs back in their places and put the trays on the shelf. The second shelf is not an interactive item.
Place the ozone generator in the cold storage, and head to the control room. On the board on the right, there will be clue No. 5 — bingo. Remove the body and set aside the found figurines. Place the globe next to them, which is in the trash behind the door. These items will need to be arranged on the shelves later. Slide in the leather chair, pick up clue No. 6 — voicemail from the table, and from the nightstand, take cassette No. 1 — PROSCIUTO CORE. Crumpled sheets of paper, which can be found under the table and behind the shelves, are also considered trash here.
Enter the freezer. The room is small, but here you can pick up clue No. 7 — interrogation recording, clue No. 8 — hammer, clue No. 9 — pliers. After cleaning, you can go to the backyard through the control room. Interact with the gate to open a shortcut to the car.
Near the waitress lies clue No. 10 — phone. Otherwise, it's standard cleaning here. If you can't find a puddle, use the ozone generator or UV lamp. All that's left is to clean the old lady's room, opposite the water tap. There is no trash or secrets in this room, you just need to get rid of the bloody traces and spilled paint.
All Secret Places in Chapter 4
In the backyard, turn right towards the sink. Open the door and go to the end of the room. The passage further will be blocked by wooden sticks. Breaking them, you can find the first secret place and many valuable items.
To the left of the waitress, there will be a fence. Place a ladder or several interactive items on the corner to get into the secret area. Climbing up, the "Rock and Roll All Night" achievement will be unlocked, and you can also find cassette No. 2 — SONNE UND HELL.
Enter the control room and clear the floor of boxes under the dartboard. There will be a door in the floor that opens with the unknown key you picked up earlier from the desk in the main hall. Take all the valuables and crack the safe to receive the "Treasure" achievement.