Internet - Colleen Cameron recorded a very special cleaning mission for TikTok and made millions of users gag with her disgusting discoveries.

When the young woman packed up her things to go to college, her sister swapped rooms with her, so Colleen had to bunk in her sibling's room after returning home. That led to a viral, extremely upsetting TikTok clip.

To say her sister's basement room was messy would be the understatement of the millennium!

For the next few hours, the student was forced to make the space fit for human habitation.

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And with this very process, the young woman reached millions of users. 

In the beginning of her video, she walks down the stairs to her new home and is greeted by several mountains of laundry on the way.

The scene she then encounters is even more gruesome: it is filled with tons of trash, leftover food, and empty water bottles.

And as if that wasn't horrific enough, it soon got much worse.

As she continues to find bottles strewn all over the place, she notices that a good few aren't empty.

They contain a yellowish liquid and Colleen soon realizes what she's looking at: pee! 

Disgusted, she can't help but gag while disposing of them.

It took Colleen a total of four hours to get the room shipshape again.

While many users were deeply impressed by Colleen's cleaning skills, most were disturbed by the initial condition of them room.

"Why not like just...... go to the bathroom," one user commented in horror, while another only wrote: "You're sister should be embarrassed".

Not long after, Colleen posted an update for all her distressed followers, explaining that the bottles of urine were not from her sister, but actually from her sister's boyfriend.

"Why? not sure guess he was lazy which yes i know is disgusting."

At the end of the video, Colleen goes upstairs to her old bedroom, which her sister  took over, to take a look inside. And surprise, surprise: "Yes its now a mess too."