The transparent rubber bands around the brackets turned yellow when I ate the curry sauce. There are 2 weeks until the appointment. How can they be cleaned?

Jučer sam jeo pileći curry i moje prozirne gumice su doslovno postale fosforescentno žute! Četkala sam ga, ali ne skida se. Moj termin je za 15 dana, mogu li doći ranije i samo promijeniti gume?