Cleaning the block
My opinion, you will never get oxidized dirty aluminum to look shiny without a huge amount of work. If there is a product out there to do the hard work I don't know what it is.
IF you want the aluminum shiny, a wire wheel works good.
couple pics for examples
So we start out with a little pressure wash, a little degreasing, a little scrubbing down

That knocked alot of loose dirt free, a good start.

After a little wire wheel they really shined up nice, this is just so I can see what I am working with.

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