I just did a quick search, and people recommend denture cleaning tablets in hot water and gravel to clean washer and radiator bottles.
I bet a bucket full of gravel and hot water with some denture tabs dropped in, then swish the bottles around in there, then repeat with gravel inside, would yeild some good looking parts.
I'm all for reusing serviceable parts! But there's definitely something nice about shine.
Rusty bolts or nuts can be dunked in rust converter for a bit and then oiled prior to install. Should keep the rust away for a while, and turns the iron oxide into either iron Phosphate or zinc/mag Phosphate.
Just a couple suggestions if you get bored. I know cleaning isn't anyone's favorite parts of the project! LOL. There's also nothing that says you have to have it all perfect. **** gets used and will wear as a result. Function and reliability is really all that matters.