Fatbergs — massive buildups of wipes and hygiene products congealed with greases and oils — make for a cringe-worthy topic. And the damage they cause to sewer systems can be a huge amount of trouble for the people in charge of those sewer systems.

That includes Candice Miller, the Public Works Commissioner in southeast Michigan’s Macomb County. A giant fatberg there cost the county upwards of $50,000 in removal costs in 2018.

Fatbergs have appeared in England and Australia (where they’re called “ragbergs”) and all around the U.S. and Canada.

One of the main ingredients for these fatbergs is wipes—both flushable and non-flushable.