Title: The Yellowing Saga: A Cost-Effectiveness Comparison of Anti-Yellowing Solutions for Polyurethane Shoes Introduction: The Bane of White Sneakers If you’ve ever owned a pair of white polyurethane (PU) shoes—be it sneakers, loafers, or fashion-forward kicks—you’ve likely experienced the heartbreak of watching them turn yellow over time. Like a banana ripening in the sun, your...