Years ago at local bumper shop (rechrome, straighten, etc) . . . before they wrapped up the rechromed bumpers, they would wipe them with a solution of "Bon Ami" . . . same as "bar keepers friend" . . . make a paste with it, then wipe the chrome, and let dry to a haze, then wipe off . . . been best kept secret. . . takes all the crap off and will not scratch . . .nothing like an "old timers" tip . . .(uhh,not that I am getting to be old timer . . .)