Just a little white spray paint (use a satin finish ideally) and some masking tape and make old dirty shoes look new and white again!! It doesn't last as long as the original finish but it lasts WAAAY longer than that cheap white shoe polish stuff with the foam applicator you find in shoe stores
What Is Reverse Oxidation and How To Treat It
How to Paint Shoes (with Pictures) - wikiHow
How to Keep your White Sneakers White
HOW TO CLEAN & WHITEN YOUR SHOES - EASY FASHION HACK
How to Clean White Shoes
How to Clean White Vans - Easy Ways to Clean White Vans Sneakers
How to keep sneakers white – Jess Keys
How to Clean White Sneakers
How to fix old shoes: Tips to repair sneakers easily
How to Bleach and Clean White Shoelaces
How to keep sneakers white – Jess Keys
How to Make Your Sneakers Look New Again: 15 Steps (with Pictures)