This is mine after 1 yr and ~7800 miles. Did a clutch line flush last july using valvoline dot 3/4 fluid. There's a thin layer of that dark sludge at the bottom.
Here's a close up pic taken in the day time. Dark honey colored. Flushed it out with prestone dot 4 this time. We'll see what it looks like in 3 months. Nice and clear now. Did a combo of gravity bleed + traditional to finish it off. Went through about 3/4 of a 12 oz bottle.
What's odd is probably 90% of those 7800 miles were mostly highway. I'd expect there to be more debris with greater city driving.