They are known as fatbergs and they could soon be a major problem in the Southern Highlands.
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The recent shortage of toilet paper and subsequent increase of other products being flushed down toilets could lead to a new crisis - clogged pipes.
The situation has prompted a warning from Wingecarribee Shire Council urging people not to flush products such as tissues, paper towel or wet wipes down the toilet.
Council spokesman David Sommers said that flushing such products could block pipes because unlike toilet paper, they didn't break down in water.
"They stay intact and as they travel through the sewerage pipes they get caught on debris, roots and within our pumps and machinery," he said.
"We estimate that more than half of all of our sewer blockages involve flushed wet wipes and other items that don't belong in the wastewater system."
And the problem is likely to get worse as people are forced to opted for alternatives due to the recent panic buying of toilet paper.
Mr Sommers said that unlike many metropolitan local government areas, Wingecarribee Shire Council managed its region's network of sewerage services.
"Across our shire council looks after six sewage treatment plants, 74 pumping stations and more than 600 kilometres of sewer pipes," he said.
"Like many water and sewerage utilities around the world, we've been experiencing an increase in problems associated with wet wipes and other products in our wastewater system.
"But it's not just our wastewater system being clogged by these products. They can also block household sewerage pipes which can result in a costly plumbing bill for home owners.
"Remember that despite the claims from manufacturers these products aren't flushable."
Mr Sommers said that rags, nappies, sanitary items, cotton buds, dental floss, cigarette butts, cooking fats and oils were other common items that clogged council's sewage system system.
Tissues and paper towel have more recently been added to the list of clogging concerns.
"All these items should go in your red household garbage collection bin," Mr Sommers said.
"When these items combine in your wastewater pipes they can form a hard blockage called a 'fatberg'.
"These blockages are costly and time consuming to repair and can result in overflows causing health and environmental problems.
"Remember the only things that should ever be flushed are the three P's - pee, poo and (toilet) paper."
To report a blockage call Council's 24-hour Contact Centre on 4868 0888.
