Cleaning Rusty Chrome

I have an old Colombia 3 speed cruiser that I left outside for at least a year. I guess I lost interest in riding it after the rear tire got a tear in it. After getting another 26x1-3/8" tire, I decided to fix it up again (this would be the 4th time I've reconditioned this bike, it's had a hard life). Anyway, I used some wet aluminum foil to clean the chrome fenders that had rusted pretty badly:

There's a lot of pitting on these fenders, and they're in bad shape. I won't be able to bring them back 100% but I still tried out my aluminum foil trick:

After a few minutes of scraping and rinsing off the rust, here was the result:

Not perfect, but a lot better than what I started with. The pitting went through the chrome into the steel underneath, which is why those specs are still visible. If the chrome was only surface rusted then the wet foil would leave it looking perfect. Oh well, cheers.