I've tried bleach without sucess, the chrome on the parts kinda turned yellowish but didn't come off after an hour or so.
Maybe it was just the specific kit I was doing, age of the kit, whathave you.
As a result, I use the cheapest generic Oven Cleaner I can get usually at Kroger or the $ General.
It'll strip all the chrome off of the parts in about 10-20 minutes max.
What I normally do is put the parts in a glass bowl, spray some cleaner in it, dump in the parts, spray someomore cleaner until everything is covered, let 'em sit for 10 minutes, rinse everthing off thoroughly, and check the progress.
If needed, repeat.
Wear gloves too, that stuff will definately let you know if you have any cuts on your fingers
I'd definately rather smell the bleach than the oven cleaner but 10-20 minutes beats an hour+ in my opinion...