I strip a lot of chrome and I've used 2 different things very successfully. Vinegar, just put regular white vinegar from the kitchen cupboard in a jar, put your parts in and wait. Sometimes it might take overnight, but I have seen it come off in an hour. The other thing is Westley's Bleche-White (that's how it's spelt). You can get this in almost any auto parts store in the detail department. It's whitewall tire cleaner. Use it the same way as the vinegar, this stuff works really good. I've read that you can use it to strip paint off a model, but never tried it for myself. Just remember, no matter what you use to strip the chrome, a good rinse with water will be needed afterwards.
Ken