Add Yahoo as a preferred source to see more of our stories on Google. hot cooking oil in a frying pan on the stove - New Africa/Shutterstock If there's one thing you should never do in the kitchen, it ...

Are you ever tempted to pour used cooking oil down the sink? Just turn on the tap and flush it all away. What about that half-used tin of paint in the cupboard? It would be so easy just to wash it ...