You can use an application of TSP (Trisodium Phosphate). Use with very warm to hot water. This application is used to paint glass, so it should have no problems on chrome (do a small test area). TSP is available in the Paint Dept.
By
06/22/2008
Sand it with fine to medium grit sand paper (get the kind they use for metal from a hardware store)
After sanding it and roughing up the chrome - prime then paint.
Also you can use acid on the chrome to roughen up (also available @ the hardware store) then use a neutralizer for the acid, wash, dry, prime and paint -