Quote Originally Posted by Irelands child
DC9's tuna can works about as well as anything but you still drip some nice, soon to be a gummy, black crud gasoline on that nice new bright and shiny rough cast aluminum intake manifold that is only cleanable with a fresh glass beading

Red rag under the tuna can helps, but like you say, not long until the aluminum intake is stained.

Last couple of aluminum intakes I've had I took em out of the box and straight to the powder guy.

Powdered black, they still look good after several years of use.

I believe they have a powder 'color' now that's very close to brushed aluminum.
Thinking of using that on the 31's calipers.