Mothers MAG & ALUMINUM POLISH is the stuf the show Harley boys use, polished up my 996 cans to a chrome-like finish, did both in about an hour and without the black fingers Autosol leaves you with!
...also leaves a coating that stops the finish dulling.
Only place I've seen it was West Coast but they've now gone, Google search should come up trumps - was about £6 a tub but lasts for ages.