A campaign to stop people flushing rubbish down their drains and clogging the sewer system is highlighting the £7 million annual cost to taxpayers.
Around 80% of the 40,000 blockages last year were caused by people putting the wrong things down sinks and toilets - from nappies to cooking fat, and even pants and jeans, according to Scottish Water.
The utility company is running a broadcast campaign to help people understand how they can play a part in keeping the system flowing while saving on household bills.
"Cooking fat, oils and grease coupled with bathroom waste such as cotton buds, nappies and baby wipes creates a perfect storm of solidified fat and material that can't break down easily like toilet paper and collects in large clumps beneath Scotland's streets," Scottish Water says.
"This leads to the misery of flooding of thousands of properties across Scotland, leaving householders and communities with the hassle and expense of repairing damaged property and sometimes resulting in pollution to local rivers and burns."
Drains are designed to take only used water, human waste and toilet paper, the firm insists.
Iain Gulland, director of Zero Waste Scotland, said: "I welcome the launch of this new initiative by Scottish Water to raise awareness of how to keep the sewer system clear of waste.
"Where food waste is concerned, it's important that consumers understand how to dispose of it properly. Food waste that cannot be used or avoided is easily recycled or composted. Over half of households across the country now have access to food recycling services and we are continuing to roll these out in towns and cities nationwide.
"Waste is a resource and there are significant environmental and economic benefits for Scotland if we work together to manage it more efficiently."
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