The normal induction cleaning I do is to simply keep the throttle
plate clean and the flame trap clean. You clean the throttle by
wiping it out with a rag using a "light" solvent (once a year).
The flame trap cleaning instructions are here (this also gets you
access to the throttle plate):

http://volvospeed.com/Repair/ftrap.htm

They also have the EGR service procedure documented (not as simple
as spraying it clean):

http://volvospeed.com/Repair/egr.htm

The site has many other do it yourself Volvo service procedures, too.