Acronym for the Exhaust Gas Recirculation valve. It is a smog device which diverts spent exhaust gases back into the intake tract to help limit temperatures in the combustion chamber. The main purpose was to help reduce NOx emissions.

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BMW E90 M47TU2 EGR clean

I have a BMW E90 2007 with a M47TU2 engine, Can anyone tell me where the EGR valve is, how to get it off and how to clean it (with what?) Thanks
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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 ...