Mechanic In A Bottle is the solution to FIX poor or non-running 2 and 4 cycle engines due to modern fuel issues. This synthetic fuel additive removes all varnish in the fuel system without having to remove the carburetor, removes carbon deposits and water, revitalizes rubber and plastic components, replaces lost octane and rejuvenates old fuel. Cleanses your equipment’s fuel system so that it starts efficiently and operates in top condition.