The landlords here keep pleading with the residents to quit pouring their used cooking oil down their drains. They say it goofs up the sewer lines.
it doesn’t help. if the oils are solids at room temp they’ll be solid in the pipe.
My BIL is a plumber....he says the worst thing you can do is to put hot grease or oil down the drain. If you have to do it, run it with cold water. It keeps the oil from infiltrating and building up as much.
London had a massive “fatberg” in their sewer system for that very reason. It was about the size of a city bus.
Eeech.
http://www.bbc.co.uk/newsbeat/23586290