Are germanium transistors still used in new builds? Do they have an advantage at any time? I have a collection of those as well.

I think they are used in some guitar effects boxes, maybe just for reproducing classic designs from the '60s.

 

Sure, but that's just insane.
Resistors cost about a penny, how much is your time and sanity worth?

If Radio Shack doesn't exist anymore and the only local electronic parts store is only open Monday to Friday, 9 to 5, cleaning corroded leads doesn't seem crazy.