With the rise of GDi engines, has anyone tried the new valve cleaning products that all the big companies are pushing out? I know our secondary valves are big carbon collectors, and since my IMRCs are removed I've been wondering how effective those products would be for cleaning the valves and intake tracts in the head. When I replaced the IMRCs, I neglected to clean the valves, since it was a do it in one day and get back on the road kind of job.
