Anyone ever have a carbon treatment done??

[Ryan95gt]

I failed again for co, it was more than double the allowed limit. Its a mostly stock, freshly tuned 95 gt with 63k on it. The previous owner babied the car, I dont nor do I beat on it but I hardly do any highway driving, most of my commutes are about 15 min. Im thinking I have bad carbon built up and I heard about a carbon treatment that shops do. I guess you hook it up to your fuel system somehow and your car pretty much runs on it then at the very end you dump all of it in till the car stalls. You let the car sit all night, next morning you take it out and get on it hard for a while. Anyone ever heard of this or have this done? I tried that Techron treatment by Chevron, co was still the same next time I went back.