I am aware that there's a GM product used to decarbonize the engine, and it works well. I am also aware that there are other alternatives. This is one method I've used in the past with great success. Before you bash my ideas, please listen to my logic.
I am wanting to do it to my C5.

I like to use water to decarbonize engines, specifically distilled water since it is pure and has no minerals or other chemicals, so it won't leave residue or deposits.

"But that's heresy!! Water does not belong in an engine!! It'll destroy it!!

True, water is not compressible, but with the engine running fully warmed up and water being slowly introduced, it will not harm the engine. Same rate and procedure when using Seafoam. You don't want to kill the engine. (Stall it)

But why water? Water is H20. By evaporating in the combustion chamber, the compound splits, reacts and burns with Carbon, effectively burning it off, like steam cleaning it.
Case in point? Look at a cylinder with small head gasket leak. How do you know which failed?
the piston and combustion chamber looks machined clean. No Carbon deposit anywhere.

WWII planes also used a rudimentary water injection system on their planes to deal with detonation and hard use. It was later on changed to Nitrous, if memory serves me right. Side effects were clean engine internals on both products. Older gearheads also used ATF to dislodge carbon. This is the same principle, just a different product used.

like I said, I've used it before on other cars, and I can attest that yes, it does work. Car felt smoother and hasn't pinged as much. I do recommend doing an oil change right after. Of course as a disclaimer, attempt at your own risk.
Best of all, it's cheap. I know off the shelf products can be expensive.

What are your thoughts?

https://m.youtube.com/watch?v=KFtp_jmLF3k&pp=ygUWRXJpYyB3YXRlc iBkZWNhcmJvbml6ZQ%3D%3D

If the video doesn't work, and you want to know more, I just searched on YouTube 'Eric the Car Guy Water Decarbonization'.

 

First are you having carbon issues or a high rate of oil consumption?
If not then don't worry about it. Carbon is really only a major problem on some Direct Injection models.

Yes their are a dozen ways to clean this and most take some experience while others only work marginally. Generally most Corvettes are driven hard enough they generally have low carbon issues vs some car puttering around town at low speed and RPM.

I remember in auto shop we had a teacher show us how to use Tranny fluid to try to clean an engine and so we all rushed out and did it and found it made little difference and we never had an issue to start.

Might just stick to Techron and top tier gas and you should be fine unless you are burning oil. Good for the sending unit in the tank too.