The "proffesional" injector cleaning (where they actually pump raw cleaner thru the injectors) the likes of which is found at sears and such is excellent. Back in college, I took a toyota mr2 to sears for the injector cleaning, and man when i got it back, those things were tickin like they were brand new.
ps. . remember to disconnect/reconnect the battery after cleaning... if your car has one of those "learning" computers, it will need to start at ground 0 again.