[R-390] Cleaning?

[n4tua at aol.com]

Hello,
I am cleaning my new 390A and need some advise. Is the slight yellow color on some of the transformer cans and other chassis areas going to come off with polishing with never dull? Is this good? What is a good cleaning agent for a dull looking insides. I have also found a trick some may know. Some of the transformer cans were crushed down from to much fastener tightening. I made a wooden die to fit inside the can and have formed it back to original shape again. Some of the cans look as if they came with no hole for adjustments. Some one either drilled a hole or enlarged the hole rather crudely. I have cleaned these up a bit also. Any help on cleaning chassis?
 
Thanks, Collin