I have your same machine. I had brown snotty like stuff on a bathrobe. I spot cleaned the bathrobe and washed it again only to find out the debris was from is the washer not the bathrobe. I ran the self clean, then did a heavy duty hot load a several times alternating with 1. “affresh” tablets then 2. 1/2 cup soda with 2 cups of white vinegar and then with 3. chlorine in the “liquid bleach only dispenser. It seems to have fixed the problem. Actually I think the problem occurs at the top of the washers drum. I wiped the drum and had no debris on my clothes till I wiped the underside of the rim that turns with the drum. This would only effect the very full loads of laundry which is why the first time I encountered the problem was when I was washing a very large load.
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