[alfa] cast aluminum clean-up

[GModelle@xxxxxxx]

Gentle Alfisti,
Today the crankcase, sump and front timing cover came back from the machine 
shop where they were hot-tanked. The results were not-so-hot. The aluminum has 
staining that the tank treatment couldn't remove. Has anyone on the Digest 
been successful with other cleaners/brighteners? I've been cautioned against some 
caustic cleaners that turn aluminum black. Thanks.
modelle in somers point
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