Greetings, I have an acoustic/electric bass (Warwick Alien) and use phos bronze strings. The set that came on the bass were OK to boil and played them to death. I now have a set of DR "Rare" bronze strings and boiling kinda tarnished them. The more I play the more tarnish comes off. The strings sound great so it is purely cosmetic. I have not tried denatured alcohol yet. Does anyone have a technique??