> On the other hand, if there wasn't any dirt, the filters would not have clogged, so I guess it does make sense after all. Things can freeze at cryogenic temp

> On the other hand, if there wasn't any dirt, the filters would not have clogged, so I guess it does make sense after all. Things can freeze at cryogenic temperatures. Water ice, dry ice ... or other gases solidifying. There can also be FOD knocked loose by vibrations.