Will Soltron clean up hardened varnish in carburetors or old fuel tanks?
No. Soltron does not contain any heavy duty cleaning chemicals. While the enzyme will break down varnish that is suspended in fuel or remove light films typical of a cars fuel tank, it will not dissolve thick, hardened varnish or resins built up on bulk tank walls or in the carburetor, that have polymerized through fuel evaporation and heat. This type of deposit requires either chemical strippers or steam cleaning. We do not recommend in-fuel chemical strippers, unless they will be removed prior to refueling. These chemicals can get into the engines oil supply and may attack soft metals such as copper bearings. Some strippers are caustic, and can attack aluminum components. If you have hardened varnish in a bulk fuel tank, we suggest professional steam cleaning. Carburetors should be disassembled and cleaned with buffered chemical strippers. Please consult with your local auto supply parts store or a professional mechanic for recommendation of products.
