Whenever I wash my work clothes, black trousers and black shirts, they always come out covered in tiny white fibres and as such not "clean" by my standards. I wash work clothes and other things separately.
It's one of those rubbish washer/dryer combo things.

Any ideas? Other than lint rolls?

Probably contamination from the dryer element of it.

Does it have a filter that you need to clean regularly?

Do you check your pockets are empty?

The filter's as clean as a whistle and I never have anything in my pockets at work apart from a pen.

my work clothes, black trousers and black shirts

😯

Elfinsafety, something like that aye 😀