You Have Two Choices Regarding Engine Carbon Cleaning.
1. The HHO Gas Technology Engine Carbon Cleaning Way.
2. Chemical Clean way that has so many complications leaving major operational Error in individual performing the job or not applying all the applications during the chemical clean way and much more that can go wrong with the chemical way. Chemical Cleaning is the old way.
The HHO Gas Technology Engine Carbon Cleaning way is the way to go and the machines come with a two year manufacturer warranty.