Ski goggles are delicate equipment, and if you want to use them for a few more years, you must use and maintain them well. Try not to touch the mirror surface with your hands, and be more careful not to let sharp objects scratch the mirror surface (be careful not to put it together with phones, keys, etc. to avoid scratching the mirror surface). Always keep the mirror surface clean and free of stains. Observe the glasses before and after each use, and if there is any dust, brush it off with silk or glasses cloth.
When stains appear, you can use professional camera cleaning paper and gently circle around the stains until they are removed. If it is necessary to use water-based cleaning agents, neutral ones must be selected. Do not soak your glasses in water or rinse them with water, as this will dry slowly and make it easier to get dust or leave impurities after the water evaporates.