A woman has shocked the internet after sharing a viral video where she drained water from her sister's car door.

Sarah Blackbourn, under the TikTok user name bourntocreate shared the clip with the caption: "This is my sister's car that sounded like it had water in it. I had no idea."

Since being uploaded on Tuesday, April 19, the clip, which can be seen here, has gone on to be viewed more than 3.1 million times.

The viral 20-second clip was shared in response to a video uploaded by @abdelmedia, who drained liquid from his car door.

A few seconds into the video, Blackbourn could be seen unplugging a hole at the bottom of her sister's car door before water streamed out.

This is my sisters car that sounded like it had water in it! 😳 I had no idea! Thanks for the tip @AbdelMedia_ #carhack #HPSustainableSounds #thisisreal @Hudsonmatz22

Shocked, she added the caption: "What. Who else knew to do this?"

Some TikTok users were convinced the video was a prank and that you do not need to drain water from your car doors.

But Blackbourn insisted in an update post: "This was real, this car doesn't have drain holes like most. So, we have to unplug it every now and then."

The video attracted thousands of comments and was liked some 155,000 times.

Many of those commenting poked fun at the video, while others bemoaned the fact they would have to further maintain their vehicles.

One TikTok user said: "First I had to buy blinker fluid, now I have to change door fluid. Car maintenance is getting outta hand."

Another added: "All Californians are grabbing a bucket and going out to see if they can get some water for their plants."

A third commented: "I always drain my doors right after I replace the blinker fluid. It's just good to keep a routine."

Despite the intriguing nature of the video, some said it was not enough to motivate them to check if there was water trapped inside their doors.

One commenter said: "Look if I'm going to ignore the 'check engine light' I'm not about to drain my damn doors."

Newsweek has contacted Blackbourn for comment.

According to the U.K.-based website Haynes, which specializes in automobile repair and maintenance, water regularly pools inside cars.

It said the rubber seal around the edge of the door and door membrane can sometimes be the cause of leaks when it rains.

The website added there is not a lot that can be done to fix the problem until the leak is identified.

Haynes added: "So once you've found and fixed the leak, remove as much of the affected trim as you can and mop up the water with a microfibre cloth, or kitchen roll. When you've got it as dry as you can either use a plugin dehumidifier or one of the standalone units intended to prevent damp.

"Some people swear by leaving a tray of cat litter in the car. It may take time to dry the car completely, though, so whenever you drive the car have the air-con on (with the heat turned up) to help."

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