Belle Delphine, a NSFW Instagram cosplay star, told her 3.9 million followers she would sell them her bathwater.

The bottles were going for $30 each in her online store.

They sold out within three days, though the idea met with a fair amount of revulsion online.

Others praised her hustle, saying "idiots" will buy anything.

On Delphine's latest Instagram Story, she showed fans the dozens of boxes of bathwater bottles she had to send, with the caption "help me."

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Belle Delphine recently gave her 3.9 million Instagram followers the chance to buy her bathwater for $30 a bottle.

She posted two photos on Monday and said she was selling it to any "THIRSTY gamer boys" out there.

The 19-year-old cosplay star has become famous for her NSFW content, where she wears very little clothing and makes ahegao facial expressions, sometimes used in Japanese anime and manga pornography.

In June, she made headlines when she told her followers she would make an account on PornHub if her photo received over 1 million likes. But instead of anything sexual, she posted bizarre videos of herself stroking stuffed toy cockerels and eating a picture of PewDiePie.

Read more: An Instagram star tricked her fans into thinking she was making porn, but actually posted videos of her stroking stuffed toys and eating a picture of PewDiePie

i am now selling my BATH WATER for all you THIRSTY gamer boys 💦 check out my new shop where im selling stuff for you!! www.belledelphinestore.com A post shared by Belle 19 (@belle.delphine) on Jul 1, 2019 at 3:11pm PDT Jul 1, 2019 at 3:11pm PDT

The bottles of GamerGirl Bath Water came with a disclaimer: "This water is not for drinking and should only be used for sentimental purposes."

She advertised her product by posting videos on Instagram of her playing in the bath and pouring water all over herself. It must have worked, because the bottles sold out in three days.

She said on Twitter that she didn't expect to sell out or "have THIS many baths either."

"For anybody waiting on one don't be worried if they're a lil late im working on getting them to you as fast as I can!" she wrote.

While some people were clearly into the idea, others said that anyone who bought bathwater for $30 was "sad" and "pathetic."

"Can we all just be civilized and please not buy this?" the account @moistbrownieboy wrote on Instagram.

"If you buy this you have failed humanity," another wrote.

Read more: The Instagram influencer whose 100,000-strong following got wiped says she called the police because it felt like 'a murder'

However, others commended Delphine for her hustle.

"I have a ton of respect for this girl," one person wrote on Twitter. "She makes money with idiots. Best way to make money, take it from stupid people, make them spend all on this nonsense, plz!"

The YouTuber Ethan Klein said: "Congratulations Belle on all your continued success."

On Delphine's latest Instagram Story, she showed fans the dozens of boxes of bathwater bottles she had to send, with the caption "help me."