I have a pair of white leather shoes, that are still in very good condition, but are quite dirty and thus look scruffy.
How can I clean them up to make them look nice again?
Use a kitchen cleaner and a slightly damp soft cloth - I generally try Mr. Muscle first, a spray cleaner meant for worktops and the like, but usually finish up using a cream abrasive such as Cif to get off excessive mud and marks on my leather trainers. Wipe over with a different, damp cloth to get off any residue, allow to dry and finish off with a white shoe treatment such as Scuff Kote.