Yeah, you have to be careful with anything you try. I've had gasoline remove paint, and even Wd-40 on tobacco tins.
I carefull try to clean Composite cans, but it can be tricky. I use the wd-40 gently on them. Depends what it is. Sometimes just water if its dirt.
As for the brake fluid, you have to be careful. It was a last resort thing. Also i did a old Canada Dry cooler this way.
I use to help with rust, a think called evaporust, sometimes it helps, other times it does nothing.
Not a can cleaning here, But i had a sunoco antifreeze plastic bottle, and pealing the tape someone had put on was going to take the ink off, so i soaked it in WD40, and it worked like a charm.
Take care Guys!
