Clean the EGR out with swafega and a tooth brush, carb cleaner is also good and lots of rags, the inlet manifold can be cleaned with oven cleaner foam, and left to soak for a minimum of 3 hours then jet washed out, remembering to remove the MAP sensor from the side of the manifold first and the rubber seals which can be used after.
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You want it something like this inside after cleaning.
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Ones I have prepared for our Nano meets
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Don't forget to clean the MAP sensor as well do not poke any thing in the hole, again carb cleaner is good on a rag.
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Very dirty time consuming work if carried out correctly, wear gloves and really old clothes as you will not get the black stuff off you or the clothes.