There are probably a dozen cleaners that would 'work' but you have to make sure that the cleaner gets off the aluminum cooler or many of them will corrode the AL. There are a bunch of threads on this in the engine rebuild forum.
Find some here:
http://forums.pelicanparts.com/search.php?searchid=31758
Best regards,
Michael
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Michael 
'82 Euro SC 'Track Rat' 22/29 Hollows, 22/22 Tarrets, Full ERPB F/R, Rennline Tri Brace, Glass bumpers, Pro 2000's, 5 pts, blah blah blah
'13 Cayenne GTS
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