Dont chrome them - you wont find a cost effective chrome solution in Karachi for this job, Use a mild solution 10% of Hydroflouric acid to brighten it up.
BE VERY CAREFUL WITH THIS ACID, IT WILL EAT GLASS TOO AND IT CAN DESTROY CALCIUM IN YOUR BODY. You will lose your fingernails and most probably bones in your fingers if it gets on you. Only a small patch of 1x1 inch is enough to damage.
It does a very good job of brightening aluminium.