As a follow up to my original post:
Duro Navel Jelly is in a Pink Label plastic jar. 8 oz.
Duro Navel Jelly for Aluminum was in a blue label plastic jar, but it seems it is no longer made...(At least I could not find it online).. however, Loctite makes a similar product called:
Loctite Navel Jelly for Aluminum
Price varies from $2.85 to $4.95 for an 8 oz bottle, depending on the store.
Additionally, after doing some research, I find that many people have had very good results using Simple Green to clean aluminum. Stuff seems to work really well...
WARNING!!! The US Air Force has banned the use of Simple Green for cleaning airplanes. Seems that if it's not removed completely (under rivet heads, screws, etc) it will cause excessive corrosion and is believed to have caused a Chinook Helicopter crash.
Oven cleaner works really well also. Do not use oven cleaner on aluminum that gets hot however (like an engine manifold), since the lye residue in the pores will cause the aluminum to turn dark grey.
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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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