A proper induction service will not only clean the throttle body, but it'll also clean the intake manifold and hopefully get some carbon off the top of the valves.
Similar to my post about the fuel injection services, this isn't necessary as preventive maintenance unless your driving habits prove that you have a propensity to have problems which can be remedied by induction services. Many cars will operate a lifetime without ever having their throttle body cleaned and without needing any sort of decarboning. Most name-brand products I've used for this service seem to have little effect beyond the throttle body. Once again, GM top engine cleaner is the frontrunner.
If you've got a carboning problem, using the GM injector cleaning method combined with an induction cleaning using the aerosol GM top engine cleaner (for fuel-injected cars, since there's no carburetor to pour liquid into) seems to do quite a nice job. I fixed a Kia Sedona with a cold-start hesitation by doing this. Eventually, Kia came out with a PCM reprogram that solved the issue, but the root cause was carbon buildup on the valves.
Many of these additional "services" can be useful, but they shouldn't be done as regular maintenance. Each one will address certain issues which may otherwise be much more expensive if repaired either by disassembly to clean or by parts replacement. Unless you're experiencing an issue which one of these services has the potential to address, the service is typically a waste of money.
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