What is the most efficient way to clean the intake valves in an Audi A3?

I have noticed a decrease in performance and fuel efficiency in my Audi A3. After some research, I suspect that the intake valves may be dirty. What is the best method for cleaning them and restoring my car's performance?

The most efficient way to clean the intake valves in an Audi A3 is to use a specialized intake valve cleaner solution. This will help break down and remove built-up deposits without damaging the valves.

Another effective option is to have the intake valves manually cleaned by a professional mechanic. This may be more expensive, but it ensures a thorough cleaning and can improve your car's performance significantly.