I have a carbureted V8 engine with a vacuum line from the brake booster to the intake port of the carburetor. My master cylinder recently started leaking and it then sucked the fluid through the brake booster into the intake via the vacuum line. I now have a lot of burnt brake fluid in my exhaust manifold and wondering how to clean the residue off. I tried brake cleaner, Sea Foam, Super Clean and Gunk Engine Degreaser but barely does anything to it. Thanks for any advice.