If you indeed have chrome like on the Profile laced wheels, there isn't any substitute for polishing spokes one by one. Most dealers have the Luster Lace strips impregnated with polish that are supposed to make things easier. Never used 'em, I just go after 'em with a MF by hand. No spray & rinse product is going to give the results that manual, pain in the neck manual cleaning and polishing will give.
Many *think* they have chrome spokes on their Harley because they sparkle when new and are sadly surprised when they get dingy and they try to polish them. Unless you have the optiuonal chrome spokes most of H-D's spokes are cadmium plated. Once they get dull they'll never shine like that again. Get too aggressive with a polish and you risk stripping the cadmium off and then they look even worse.
TL <--- cast wheels are your friend