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Remove dark layer of particles stuck in Diesel engine tubes?

My BMW E36 M41 engine seems to have a dark dust in the small tube that goes out from the EGR valve. (the other tube contains a sort of dark liquid...) Is it advised to cleanup that dark matter ...
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BMW 33D 2001 no power problem

I have: BMW 330D, 2001 year, saloon, 135kw Recently I have change the turbo charger of my car. There was a problem related with this post. Then I went to the garage and they ran the diagnostics. ...