Our WA50K8600AW (purchased August 2016) is also plagued with the brown gunk. We noticed the residue for the first time this morning, ironically enough after running Self Clean. Since then we’ve run Self Clean ~10 times, including two runs with bleach and three with vinegar and baking soda. The gunk returns every time. There is no way we are putting our clothes in there now. Samsung, please make this right or lose my business forever.
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