On the smaller parts I usually clean up the seams and the sink marks then touch up with Molotow chrome pen. Then a thin coat of Tamiya smoke to tone the "toy like" brightness down.
On the larger ones I'll strip and I'll airbrush the Alclad chrome system. Practice on a few scrap parts, it's a fairly easy learning curve. Just let it dry thoroughly and handle as little as possible. This is the easiest and cheapest way that works for me. Try a few of the ways mentioned and you'll know what works best for you.