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Worked in an ESA lab with cleanroom. My work had to do with plants, their composition etc.
Naturally I had to dry some plants before throwing them into the analyser, but my designated oven was occupied.
Fear not, I thought, there is another oven over there. I put my samples in and call it a day.
Come over the next day, kinda late, lab chief looks at me and is only like "ummm, you should head over to the offices and see big boss"...go over, boss guy very angry. Turns out, the other oven in the lab was reserved for ExoMars parts. Like, they disinfect the shit out of it for weeks, like, take it apart, haul every screw to the cleanroom, clean it, autoclave it, clean it again and repeat that a billion times over, certify it and clean it again. So I kinda destroyed the work of months, maybe I alone was responsible for one of the many launch delays (probably not, but I've never been told).
Arrogant young me in my first job basically just was like "maybe put a sign on it next time, lol", boss guy pauses and says "maybe you're right". So we reclean the shit out of the oven and put a sign on it. My "punishment" was to spend a lot of time in the clean room to clean some ExoMars parts. I thought "cool, stuff I had in my hands is going to land on Mars".
Fast forward some years, Russia invades Ukraine, the pipes I cleaned will never go to Mars ๐ข.
You were absolutely right..... Two ovens in a room, 1 for plant use and 1 that needs to be super clean for a specific purpose? A sign would have been the bare minimum, that should have been part of your lab training too.