Garner - last time i detailed my dad's truck, his intake tube looked worse than yours. i pulled it off, soaked it in Jaxwax super citrus, and scrubbed it with a semi-stiff bristle brush (nylon bristles, a toothbrush should work.) After i got all the nasty off it, I put it back on and sprayed the whole engine compartment down with shine all, and it looked better than the day he picked it up from the dealership!
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