Gunk is the only way i can think of to describe it! the washing machine is about a year or so old and just recently it's leaving a gooey dark residue on some of the washing. It's not a large amount but obviously a bit of a problem. I have cleaned the inside of the glass and wiped around and inside the seal but it's still happening. I've also put a 90 degree wash on to try and clear it but no luck. Has anyone any ideas?