Hello, I recnetly decided to try out some lucas octane booster in my engine and today i noticed my plugs have a thick layer of rust colored [censored] on them. So i'm not going to be using it again. I have a crate 360 magnum engine that i have been running it trhu, its got an edelbrock 650cfm avs carburetor. I have been trying to figure out what the best fuel cleaner additive would be to get this stuff out of my engine, I'm going to be putting new plugs in it so i just need the cleaner to clean the combustion chamber, I have heard good things about the berryman products and the sea foam and the marvel mystery oil. I have access to some berryman's called total fuel system clean up and it says to run thru the tank and it will clean the engine, does this stuff work pretty good?