Whatever you do, do not dump used cooking oil down the drain. It will clog your pipes and makes a mess for public utilities. Instead, allow the fry oil to cool completely before transferring to a container with a lid. The container can then be thrown away without risk of leaking. If you'd like to save and reuse your oil, cool first before pouring through a strainer to remove any brown bits. Transfer to a sealed container and keep in the fridge for up to a month.