What is the black dust that comes out when washed with a washing machine?

After washing with a washing machine, something similar to black dust comes out on my clothes, so why is that?

After washing, I can't see the dust even if I look at the washing machine.

It's not like you put it in and spin it with paper, but where does it come from?

If there is a solution, please let me know.

411 3 7 years ago

pu1. It's because there's dirt on the inside. If you clean it up, it'll be clean

2017-12-07

pu2. http://m.blog.naver.com/eshukina/220906601483
You can't wash it off with soda percarbonate. Do it the way it's on the blog above.

2017-12-07

pu3. Thank you for letting me know

2017-12-07