This is a net for waste thread of the washing machine. I usually cleaned it after it was full of waste thread before . But now, I make it a rule to clean it every time I use the washing machine. So I can keep clean it.
洗濯機の糸屑フィルター、前は糸屑でいっぱいになったら掃除してたけど、今は使う度に掃除してる。そうすると、綺麗を保てる！！