here are a couple pics of results.
first, the water pump. it cleaned up super nice!
next, the manifold. the left side was the side in the bucket. the right side still looks pretty rusty/grimy.
money invested in using this process:
battery charger, already owned
5gal bucket, already owned
12v battery, already owned
2' rebar x2 = $2.29
box of borax = $2.99
clean parts, priceless!