How about using dry ice to remove carbon deposits?

[MacBrady]

Dry ice can effectively remove carbon deposits. Here is a detailed introduction to dry ice carbon deposit removal: 1. Cleaning process: During the entire cleaning process, when the high-speed sprayed dry ice particles collide with the dirt particles, the angular momentum of the dry ice particles is transferred to the dirt particles, causing the dirt to break away from the adhesion force on the object's surface, thereby allowing the solid particles to detach from the object's surface. 2. Effects: Reduces the damage of carbon deposits to engine efficiency, restores the engine's combustion efficiency, quickly restores the vehicle's original performance, ensures smooth acceleration, reduces exhaust emissions, and effectively controls environmental pollution.