i think i read somewhere that seafoam is recommended instead of the $495 fuel injector cleaning, and does almost the same thing.
A can of seafoam is $10-$15 at a gas station and should have a good effect on cleaning. Ive heard of people just adding it to gas, and/or into the oil.
I am not an expert so do research on this first, unless someone more experienced can chime in.
I know there is a DIY guide on this forum somewhere also.