Usually they're not chrome, only cad plated, and that's not nearly as durable of a finish. Just polishing will remove the remnants of it and then rust will set in. The first few wheels I re-did, I used the cad spokes from Mike's, due to cost. They looked really nice for a few years but eventually started turning gray. If I polish them more than a few times, I know I'll rub the cad plating off and they'll rust. So, I'm with Gary on this - get stainless spokes and be done with it. That's pretty much all I buy now.