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I'm very sceptical that this can have any meaningful effect
I don't know if you're talking about carbon build up in a direct injection petrol engine which arises due to a lack of petrol washing the ports or diesel engines where the cause is EGR depositing carbon
If you've ever tried to clean a diesel inlet manifold you have to conclude that a few minutes of running hydrogen or whatever snake oil is used isnt going to be able to clean this
For petrol engines the cure is to walnut blast the inlet ports. I think for diesel engines it's soaking the inlet manifold with something very caustic and mechanical removal of all the shite
I'm willing to be proved wrong with anyone with proper evidence but I just dont see how any long lasting or meaningful improvement can come about with this sort of 'treatment'
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