I have tried this you can get it only from Germany, it clean the fuel system well.
PROFI FUEL-MAX fuel system & carb. cleaner:
Cleans the carburettors while you are riding your motorbike, and protects the entire fuel system against verdigris formation and oxidation, thus avoiding a lot of costly workshop time from the outset.
Specially developed for bikes.
This fuel additive is suitable for storing your motorcycle over the winter.
Prevents clogging of the carburettor, and other problems.
Contains: 270 ml