If doing it yourself, SirDimsdale has you covered...just make sure the last step using an air compressor to dry the interior throughly is key and use a bit of Seafoam/Gumout/Chemtool mixed with the fresh fuel going in and you should be good to go. Fuel is essentially a solvent, the Seafoam has a catalyst to help disburse the contaminants so they can be burned. Fuel injectors now have ceramic tips that under high fuel pressure tolerate cleaning fluids well. If you think carbon has built up, the fuel/cleaner mixture under high temperature will clean the combustion chambers and such well with a few tankfuls of "brisk" highway driving. after all your fluids have been changed out.