Yeah, you're right, because I use Easy Off for chrome removal. So, in that case this will work and it's from Dollar Tree. I use this on enamel paints. And I also degrease my bicycle chain and it's just plain good as a cleaner around the house.
Western Electric gearing up for domestic production of guitar amp tubes to fulfil demand
https://www.guitarworld.com/news/western-electric-american-guitar-amp-tubes
Maybe some rust. Just take a look at the brake rotors of cars that have been sitting around for a while, or even the day after a rainstorm. The rotors will have rust on them.