You should empty the Trash Can Mould can more often. Mold can grow within hours hence always empty the bin before it's too late to prevent mold from growing and reproducing.
Keep the garbage bin clean. After you empty the bin always clean it and replace the trash bags with new ones. This will reduce too many food materials that are favorable for mold growth.
Ensure the garbage bin is dry. Keep the bin dry at all times. This will keep away moisture and dampness which enable mold to grow.
You should disinfect the garbage bin. Every time when you put trash in the bin, check whether there are signs of mold growth. And in case there is mold evidence on the bin surfaces, use bleach solutions or the non -toxic chemicals to remove it. Also, when cleaning it, you should use disinfectants to keep away mold.