Point taken. I've wished I would have never touched a few thing in my life. The racoon in the garbage can was one for sure. Some things you leave alone. I was 12. LOL I'm 67. I survived.. Racoons are tough.
Soldered terminals could be an issue, It's usually why a lot of them are green. Cleaning after stops a lot of the GREEN. Sealer spray for marine use stops a lot more . Coastal regions more so..
I worked on a lot of sea going tugs and oil rigs. Green is not your friend.. LOL
Speakers, I suppose you could let-er-rip, why not.. I use bolder SC copper/silver/teflon for internal wiring. Woofers I use heavy copper. No need to make it complicated. Good copper connections.. Spray or silicone to seal. It's just makes for a good build.
I use to see that on a lot of the older Vinyl and PVC like Monster cable turn green. It worked..