How does the launch prep, launch, and deployment compare to the assembly of the sat? I was under the impression that eg fairing separation likely is quite messy

How does the launch prep, launch, and deployment compare to the assembly of the sat? I was under the impression that eg fairing separation likely is quite messy, perhaps even metal flakes dropping of due to abrasion and such. Silicone off-gassing perhaps not so much of an concern then.