Oven cleaner is one of the best things for removing oils and cooked on greases from iron or aluminum...
To get into the pores of the aluminum use a round stiff bristled brush and wrap tape around the bristles so that they stick out about 1" that way they don't jump all around and you can work it around and get into the pores.
Here is the intake before and after on my survivor LT1.
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~JAG~
NCRS#65120
68 GTO HO 4 spd Alpine Blue /Parchment 2 owner car
#21783 71 Corvette LT1 45k miles Orig paint - Brandshatch Green - National Top Flight - last known 71 LT1 built.
71 Corvette LT1 42k miles Original paint - Black - black leather - only black LT1 known to exist.
NUMEROUS Lemans blue Camaros,
Monza Red and Daytona Yellow Corvettes
& a Chevelle or two...
Survivors, restored cars, & other photos
https://picasaweb.google.com/lh/myphotos
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