The used cooking oil you have in your kitchen still might be good enough to reuse. Typically, you can reuse cooking oil two to three times before disposal. However, restaurants and takeaways should avoid cooking with used cooking oil that is reserved for one or two months. You should also never cook with the used oil if it has a bad odour, is cloudy, or has developed a foamy top layer. It’s the time when your cooking oil is ready for disposal.
Pouring cooking oil down the sink with hot water hardens the oil and deepens the clog.