Las bandas de goma transparentes alrededor de los soportes se pusieron amarillas cuando comí la salsa de curry. Faltan 2 semanas para la cita. ¿Cómo se pueden limpiar?

I ate chicken curry yesterday and my clear ligature elastics literally turned phosphorescent yellow! I brushed it but it doesn't come off. My appointment is in 15 days, can they come early and just change the tires?