To finish Sanitize the Factory in The Outlast Trials, find the keys on corpses on the Toy Factory’s second floor, read the TV above each production line’s lock to see which key it needs, then open the four lockboxes and carry the acid buckets to the Sanitation Tank in Section D. Press the Button Switch beside the tank and run for the West Shipping Dock, because the sprinklers then shower the production lines with acid. The MK-Challenge arrived with the Season 7.2 update on October 20, 2026, in Phase 2 of the Geister event, which runs until December 8. Red Barrels has not published exact key spots, a recommended rig or a solo Psychosurgery strategy.
Summary: The Outlast Trials Sanitize the Factory
- Where: the Toy Factory, entered from the East Shipping Dock.
- Goal: fill the Sanitation Tank in Section D with four acid buckets, press the switch, then escape.
- Keys: hidden in corpses on the second floor, matched to lockboxes by the TV screens.
- Danger: after you press the switch, sprinklers pour acid on the production lines.
- Exit: the West Shipping Dock.
- Event: Phase 2 of Program Geister, which ends December 8 at 10 AM ET.
- Not published: exact key spots, a best rig and a Psychosurgery solo route.
What Is Sanitize the Factory in The Outlast Trials?
Sanitize the Factory is a new MK-Challenge set in the Toy Factory, where Mother Gooseberry is the trial’s Prime Asset. Red Barrels introduced it with the Season 7.2 update, alongside Compel the Children and a returning Halloween event called Program Geister.
The premise is a flood of acid. Easterman’s pre-trial line tells you that you are the rain, a drop in the flood that will drown the wicked and cleanse the filth. In practice, you collect four buckets of acid from lockboxes spread across the factory’s production lines and pour them into one tank.
The tank sits in Section D. Each of the four sections has a production line with a locked box that holds one bucket. You unseal the boxes with keys, and the TV screens in each section tell you which key goes where. For the official summary, see the Season 7.2 patch notes from Red Barrels.
Release, Geister Phases and Dates
The patch notes say Sanitize the Factory is featured in Phase 2 of the Geister Program and is available in GENESIS. Compel the Children is the Phase 1 challenge.
| Detail | Status |
|---|---|
| Update | Season 7.2, released October 20, 2026 |
| Sanitize the Factory | Phase 2 of Program Geister |
| Geister ends | December 8, 2026 at 10 AM ET (7 AM PT) |
| Event tokens | Forfeited after the event catalog closes on December 8 |
| Platforms | PC (Steam and Epic), PlayStation and Xbox |
| Cost | Free update for owners |
A fan wiki lists Phase 1 as October 20 to 27 and Phase 2 as October 27 to November 3, but the official notes do not give phase dates. As a result, if you cannot see the challenge yet, check the Geister phase in your game. Both challenges also appear in the Geister trial rotation, which means you earn event tokens while you play them. For another co-op horror update, see our The Other Side Halloween event guide.
Step-by-Step Walkthrough
Here is the full route, combining the official summary with the community wiki’s trial description.
- Enter from the East Shipping Dock. You infiltrate the Warehouse factory line, where all four production lines are covered in yellow tarps.
- Spot the lockboxes. Each section, A through D, has a sealed box with an acid bucket and an electronic lock.
- Read the TV above each lock. The screen shows which key opens that box.
- Search the second floor for keys. The keys hide inside corpses.
- Open each lockbox. Take the acid bucket from the box.
- Carry the bucket to Section D. The Sanitation Tank is there.
- Fill the tank with all four buckets. The tank only works once it holds all four.
- Press the Button Switch next to the tank. This starts the sanitation system and the exit procedure.
- Run to the West Shipping Dock. Avoid the acid and any Ex-Pop.
Gooseberry and the Ex-Pop patrol the factory while you work. Therefore, plan to split the job between players or move carefully in solo.
Second Floor Key Locations
The official sources agree on one thing: the keys sit in corpses on the Toy Factory’s second floor. None of them give exact spots, and the Red Barrels notes do not describe a fixed layout.
That means any list of body positions is a guess. What you can do is work through the floor systematically:
- Clear the second floor in one sweep. Start at one end and finish the whole level before you come back down.
- Check every body. The keys are inside corpses, so look at each one you find.
- Remember the key colors or symbols. You need to match them to the TV screens later.
- Split up in co-op. One player can search upstairs while the others scout the production lines.
Because the production lines have yellow tarps and heavy machinery, expect some bodies to sit in less obvious spots. We will add exact positions once players confirm whether the layout is fixed or random.
TV Clues Guide
The TV screens decide which key opens which box. A television sits above the electronic lock in each production line, and it indicates the key that box needs. The wiki describes this as scanning the clues on the TV screens.
Here is a simple method:
- Visit each production line first. Read all four TVs before you go upstairs.
- Note what each screen shows. Write down the symbol or color for A, B, C and D.
- Search for matching keys. Match each key you find to the right section.
- Return with the right key. Do not carry a spare key you do not need.
Because this order saves backtracking, split the clue-reading between players if you can. One person calls out what the TVs show while another searches the second floor.
How to Fill the Sanitation Tank
The tank needs fuel to run. Four acid buckets sit sealed in lockboxes, one per section, and you must bring all four to the tank in Section D.
The wiki’s summary of the trial adds an important caution. Reagents carry the buckets back to the tank while evading Gooseberry and the Ex-Pop. In another acid trial, Vindicate the Guilty, the wiki says carrying an acid bucket stops you from sprinting, jumping or vaulting, and spilling acid hurts you badly. Red Barrels has not said whether the same rule applies in the Toy Factory, so treat it as a likely risk and walk carefully.
Here is a safe routine:
- Open one box at a time. Carry that bucket straight to Section D.
- Listen before you move. Ex-Pop patrols make noise.
- Pour all four. The Button Switch only matters once the tank is full.
- Keep one path clear. You will return to the tank several times.
Because the tank sits in Section D, start with the lockbox in Section D. It is closest to the tank, so it is the safest first trip.
Acid Rain Escape Route
The escape is the dangerous part. When you press the Button Switch, the sanitation operation’s sprinkler system showers the production lines in acid. The wiki says it burns any Reagent who passes through the sanitation area’s perimeter, and it triggers the exit procedure at the same time.
The official route is short: sprint to the West Shipping Dock. The sources do not draw a map, so you need to prepare before you press the switch.
- Scout the exit first. Locate the West Shipping Dock before you finish the fourth bucket.
- Heal up before the switch. Acid damage and Ex-Pop hits can stack.
- Agree on one runner. In co-op, someone presses the switch while the others are already at the exit.
- Avoid the production lines. Those are where the sprinklers pour acid.
- Move at once. The exit procedure starts as soon as the system activates.
Because you cannot undo the switch, treat it as the last objective, not a checkpoint.
Best Rig for Sanitize the Factory
Red Barrels has not published a recommended rig for this trial, so any answer is our reasoning. A community guide for Escalation Therapy calls Heal and Stun rigs the most reliable choices in general, but that advice is for a different mode.
The trial’s threats suggest what to look for:
| Threat | What helps |
|---|---|
| Acid damage and Ex-Pop hits | A rig that heals you |
| Gooseberry and patrolling Ex-Pop | A rig that stops or slows an enemy long enough to escape |
| Long carries to Section D | Anything that keeps you hidden or mobile |
Pick one healing option and one escape option, and test them on Standard before you push higher difficulty. Rig names and exact stats can change with patches, so check the loadout screen in your game.
Psychosurgery Solo Guide
Psychosurgery is the game’s maximum difficulty option. The community wiki describes it with a short phrase, maximum trauma, and notes that lost max health persists between trials. Red Barrels has not published a solo guide for this trial, so the tips below come from the trial’s structure.
- Learn it on Standard first. Players in the Steam discussions say solo is manageable if you are careful or fast, and that Standard is a good way to learn a map.
- Clear the second floor first. Collect every key before you open any box.
- Move one bucket at a time. A solo player cannot afford to be caught holding a bucket.
- Keep a respawn plan. Solo players can bank respawn lives, and one wiki says the counter starts at five in solo, but check your own run.
- Prepare the exit. Know the West Shipping Dock route before the final press.
One caution: players in the Steam discussions say that some event tasks require at least Standard difficulty, so check your task list before you play on Introductory.
Tips and Common Mistakes
- Skipping the TVs. Without them, you waste keys and time.
- Pressing the switch too early. The acid starts at once.
- Carrying several tasks at once. Finish one bucket trip before the next.
- Trusting key position lists. None are official.
- Missing the event deadline. Geister ends on December 8 at 10 AM ET.
- Forgetting your tokens. Unspent event tokens are forfeited when the catalog closes.
Conclusion
Sanitize the Factory comes down to four steps: find the keys upstairs, match them with the TV clues, fill the tank in Section D and run for the West Shipping Dock before the acid falls. Phase 2 of Program Geister carries the challenge until December 8. Plan your escape before you press the switch, and scout the second floor in one clean sweep.
FAQs
Where are the keys in Sanitize the Factory?
They are inside corpses on the Toy Factory’s second floor. Exact positions are not published.
What do the TV screens do?
The TV above each production line’s lock shows which key opens that lockbox.
How do I fill the sanitation tank?
Bring all four acid buckets from the section lockboxes to the Sanitation Tank in Section D, then press the Button Switch.
How do I escape the acid?
Sprint to the West Shipping Dock after you press the switch, and avoid the production lines.
When is the Geister event?
It started on October 20, 2026 and ends on December 8 at 10 AM ET. Sanitize the Factory is in Phase 2.
What is the best rig for the trial?
Red Barrels has not named one. A healing option and an escape option are a sensible pair.
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