Most top-tier fuels already contain some form of fuel system and combustion cleaner. To supplement this effort, go with cleaners that has "...Amine" in it. There are many brands out there but I can't valid their effectiveness. My recommendation is to go with Techron Plus or BG44K. Techron contains their patented world-renowned PolyEtherAmine (PEA), and BG contains PEA too. The BG company use to assist the VW group with engine carbon build-up issues.
Here's something that I use which may be of interest ...
My Fcar mechanic always recommends Lucas and a bit of spirited driving.
He also suggest staying away from BP and I have found this to be true in my area.
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