My Samsung washer, model WF45N5300AW/US is leaving brown splatter spots all over my laundry! The spots seem to be grease-based, or something else impossible to remove from clothing, because everything that goes in comes out ruined. I regularly clean it and run self clean cycles as Samsung recommends, which make no difference.
The washer is just shy of 2 years old! This same thing actually happened to me with a previous Samsung washer also only a few years old and this current one was the replacement. Shame on me for trusting Samsung again, and now it's out of warranty and I'm stuck with (another) $800 piece of garbage.
Run the Self Clean cycle.
If this does not help please send me a private message with your full model and serial number?
There's your problem in the baove link. There's probably a pound of sludge in and under your agitator plate.