This cleaner from Liqui Moly is extremely effective at removing carbon deposits from your car. It can be run through your fuel tank, or it can be introduced into the car through a vacuum line. Carefully inject this into your intake manifold to clean intake valves on direct injection vehicles.

• Breaks down deposits on valves and in the combustion chamber
• Removes and dissolves residues throughout the fuel system (when added to tank)
• Protects against corrosion 
• Environmentally friendly 
• Prevents carburetor icing
• Proven performance with turbochargers and safe for catalytic converters