If you can buy injectors for $12 I sure wouldn't waste any money on cleaner.
Does the rest of the world subsidize Malasia. That price is 30% below wholesale in the US; much less than US dealers pay. If I recall, you never pay for labor. Seems Malasia is the place to own a MB. Glad I don't work there!!!
Bosch Master, ASE Master, L1
33 years MB technician