i think its flaking limescale as we do live in a hard water area and suffer bad from lime scale even though we use calgol regulary.
will keep you posted.
our washing machine works fine all programs ok
how ever just happened in last 2-3 weeks and mainly on jeans trousers in a small area on leg we seem to get what looks like a white chalk streak marks ( at first it looks like powder but we use liquid all time ) you cant rub it off it seems like...