I have made posts on this before. The simple part of it goes like this:
-Remove EGR
-Use a paint can opener, long rod with a 90 degree angle to scrape out the soot and pull it out the opening.
-Remove as much soot as possible (metal should be visible to bottom and sides) then,
-Cap off the EGR cooler outlet with a piece of metal
-Have somebody get in car and start it and keep rpms around 1500.
-Using a long flathead screw driver scrape away the rest of the small buildups which are easily passed through the motor and out the tailpipe
-Once the intake is scraped clean shut the motor off and put the EGR valve back on.
People freak out about soot getting down into the motor but they forget it happens all the time! You don't want large pieces falling in obviously, but small pieces are fine and easily passed on through and blown out the tailpipe the first time you get on the power.
Total time for this is around 45 minutes and accomplishes a complete intake cleaning.
As far as the ports go they don't get that much build up, the other thing is nobody ever gets the soot out of the head. The main restriction occurs at and just after the EGR valve, this is why VW made the valve removable so that you do not have to remove the entire intake manifold...They know this would happen on US spec high sulfur fuels.
DB