I was SO TOTALLY ridiculously over brass polishing - Found the solution - 22k Gold Plating!
Found a terrific gold plater, I've been taking 10 - 15 engines apart at a time and sending the boilers and all brass bits and pieces to the plater and getting them back in around a weeks time and then sending off the next 10 - 15 boilers and bits.
The boilers and all the brass pieces LOOK terrific and NO MORE POLISHING!!!!!!
Best thing I EVER DID!!!!!