Bizol Unblock+F21 is a professional-grade fuel system cleaner designed to restore optimal engine performance. This 400ml formula effectively removes carbon deposits, varnish, and fuel injector blockages that accumulate over time. By clearing fuel system restrictions, it improves combustion efficiency, enhances fuel economy, and reduces harmful emissions. Suitable for all gasoline engines, Unblock+F21 works to restore lost power and smooth acceleration while preventing future deposit buildup. Regular use maintains injector cleanliness and extends engine longevity.