Well, a wirebrush and WD will work for sure, but that's a lot of elbow greese. Buy some Naval Jelly. The one for aluminum, not metal, spread it on with a paint brush, let it sit a while and then just hose it off. Viola...all done... (I like the chemical way because it gets into and cleans the pores of the aluminum.) Then either spray it with silicone or clear coat it with polyurethane. 
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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