Sex toys, fish, 5ft cute toys, shorts and 17 cans of beets are some of the odd items found in Wales sewers.
Welsh Water handles about 2,000 calls a month, requiring items such as wipes to be removed from the sewer.
It says now that the problem is very bad and should be taught in school so that children can influence their parents.
Joseph Scarpato, who cleaned the sewer, said the toilet was used as a "bin ".
Sewage treatment plants in Cardiff, all United Nations
Items that can flow are collected into a jump
The company only removes seven tons of garbage from the site every week.
The staff had mentioned the discovery of fur coats, sex toys, shorts, fish and tennis in water pipes or under the toilet.
A hole was used to store stolen items, items were placed on the shelf, and a dead horse and car parts were found in the sewer.
But the biggest challenge they face is to clean up the sewers for wet wipes and sanitary products, as well as the fat that blocks the sewers
It costs about 7 pounds a year.
While the number of blockages has decreased over the last four years, from 26,771 in 2015/16 to 22,258 in 2017/18, the company says the increase in wet wipes usage means that blockages are still a major issue.
This is not always the customer's fault, the company said, as some wipes and wipes are labeled by the manufacturer as washable
Although they cannot be biodegradable.
Joseph scarapato spent his day in the sewers of the people
Fishing things that will make even the most iron-
The stomach vacates.
After four years of working for Welsh Water, he did not see a lot of things and did not surprise him.
"I saw a doormat on the pipe, which was a bit strange, it was not even in the sewer, but in the plumbing --
"I don't know how this is done," said Mr Cappato.
The worst thing he has ever seen, he says, is that a mouse is dead and swollen, blocking Torfaen blaren-
When he took it out, it was black and covered with fat.
BBC Wales, along with Mr. Scarpato, responded to a phone call from a man who was Bargoed in Caerphilly, who tried everything he could to clear the toilet but was unlucky.
When he opened the drain cover, Mr. scarapato soon found out what the problem was --
Form a wet towel with a ball blocking the sewer.
He said they could "flood toilets, houses, streets" and even "destroy pumping stations" if they left construction ".
The problem, he said, could start with a house that would eventually block the whole street, with someone washing wet wipes at the top of the mountain and flooding the house at the bottom.
"I 've been working because the whole street is blocked and I 've been walking around the street all night," he said . ".
"You will clean a part and then clean another part of the sewage with a wet towel
Sometimes you can chase it all the way down the street.
"Water in Wales, not-for-
A profit company that manages more than 16,800 miles (27,000km)
Sewer network, the staff spend about 28,000 hours a year to eliminate the blockage. This includes 1.
There are 3 M cotton swabs in the toilet.
It is illegal to rinse anything that may cause blockage.
Emma Harris, strategy manager for pollution reduction, said: "People put strange things in the sewers, whether it's toys or dead tropical fish, and there are a lot of wipes and sanitary supplies, "I think it's part of educating our clients to make sure they understand that they don't necessarily relate what we flush off the toilet to the impact it may have on the environment.
She said that education should start from school and change habits as soon as possible
While officials do enter the school, this should be part of the new national curriculum.
"If you look at our success in recycling in this county, think about how we educate our children to do the right thing, so if the children take the information home, this is very important.