recommendation on good degreaser for engine, chassis, etc?

[TWFAUST at aol.com]

I have very good luck with a product named "B-52". Not sure of its  
availability, I get it at my local mill supply. Thin and not  particularly caustic. 
It does not "melt" the grease, consequently it requires  water wash off. 
Cheap, or about the same as Purple Power. I find it very  effective.  I don't 
recall if I have any experience using it on  aluminum.
Not sure if "mill supply" is a national term, here in New England they once 
 supplied the "mills". So they sell specialty nuts, specialty bolts, taps, 
dies,  drill bits, tool steel, lathe dogs, piano wire, etc.
 
Tom Faust