Originally Posted by Harold41
Most of the cleaners like Simple Green are slightly alkaline which can attack aluminum depending on the temperature and contact time.

Here is a different type of Simple Green that is supposed to be safe for metal. Simple Green HD I have had good results cleaning carburetors using it with no discoloration.

I also use an ultrasonic cleaner.

Phillip

Cruisin' in the Passing Lane
Former owner of a 1954 3100 w/Hydra-Matic
"To know what you know and what you do not know, that is true knowledge." - Confucius