How to make last year's Diwali diyas reusable this year?

An article by The Better India shared a creator's DIY (do-it-yourself) tip for cleaning and reusing last year's earthen lamps (diyas) for a sustainable Diwali this year. The method involves heating desi ghee, melting candle wax into it, and pouring the mixture into the old diyas before inserting wicks, preparing the lamps for reuse during the festival.