Looks good.
Is it a polish or a cleaner?
Also from personal experience I had the same buildup in my exhaust pipes as you still have after the wash. I used the mothers powerball mini with the metal polish and it restored it to new. Just thought I would throw that out there.
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2006 E90 SG-Dinan Ram Air Intake-Dinan Throttle Body-Dinan Exhaust-19' Hyperblack CSL's-15/5 tint-Matte Black Grills-M3 Spoiler Lip-Amber Delete-Smoke Side Signals
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