'Fatbergs' turned into car fuel
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'Fatbergs' turned into car fuel

28 June 2017 Last updated at 16:24 BST

Fatbergs - the collections of fat that clog up our sewers - have gone from yuck to useful.

They are caused when people pour cooking oil down the drains and can create big problems, costing water companies a lot of money to clear away.

But now, a fuel company has come up with a way to clean up fatbergs AND make them useful.

Jenny's been finding out more.