[SEL] Cleaning tin and a Baker Monitor battery box question

[Curt]

Guys,
Getting to the final details on Devin's engine. This weekend I cleaned 
up the original battery box. This was the one remaining part I had not 
cleaned and it was a reminder of just how dirty this engine was at one 
time! After at least an hour of scraping crud off the bottom and 
cleaning it in the parts washer it looks pretty decent.

The galvanized tin has a a very dark weathered look too it despite the 
fact that I hand wire brushed and ScotchBrite'd it. Do ya'll have any 
secrets for brightening galvanized metal?
There is a spot that it looks like battery acid got on. The wire brush 
removed the rust but not for long. Is there something that works well on 
galvanized to prevent more rust? A coat of polyurethane?

And finally I need to know what the top for a Baker Monitor battery box 
is supposed to look like. Is it plain tin? Also is there a wire that 
holds it on? Can anyone send a picture? What is the thickness of that 
tin? How far does it over lap the sides?

Thanks,
Curt Holland
Gastonia, NC