Sending things into space is obviously expensive as hell. One of the many, amny reasons why is the manufacturing process: everything that goes in or on a space vehicle has to be built in a clean environment, and there’s more to it than just being generous with the bleach.
Tom Scott took a trip to Innovative Space Logistics, a Cubesat manufacturer based in the Netherlands. It has an ISO level-7 clean room, meaning it has one percent of the particles you’d find in regular air. Cleanliness is achieved through double-walled rooms, plenty of filters, and a lot of special clothing.
https://gizmodo.com/the-painstaking-business-of-road-tripping-with-a-satell-1744256433
Space hardware (and, for that matter, most sensitive consumer electronics) is assembled in clean rooms because one particle of dust on the wrong camera sensor can ruin a very expensive mission (or iPhone). But even more rigorous standards are applied for inter-planetary missions, in order to not accidentally bring life from Earth on a mission to find life on Mars.
[YouTube]
