Wait till Ipcress looks at that back before you do anything to the icon,, but after that if you clean it,, just use a good silver polish and a terry cloth to get in the crevices,, then soft cloth to polish !!
Suitcase would be helped with some saddle soap, soft brush, and then when clean you can use a neutral shoe polish to protect it !! Light or matching color polish if you want to even the color a bit,, then buff well !! Didn`t look too dry on pics !!