
A disinfectant so good you could bathe in it.
With COVID-19 cases continuing to mount, it’s only reasonable to want to try and protect yourself as much as possible. Whether it’s persimmons, balloon helmets, or monsters, people are always looking for the next big thing in virus protection.
Now, something new has sprung from an unexpected source: the Yubatake hot spring in Kusatsu Onsen. Tests on the water flowing through this resort was found to reduce the effectiveness of COVID-19 to infect by over 90 percent.
▼ We visited Kusatsu Onsen in 2015 along with comedian Ike
A team from Gunma University introduced samples of the coronavirus to both Yubatake spring water and local tap water. While the tap water showed no significant change, the onsen water was highly effective at neutralizing the virus.
Readers of the news were excited that such a beloved feature of Japan has such a positive effect.
“If this is true, it’s great!”
“Hopefull, this doesn’t lead to a cluster as people flock there.”
“That’s amazing. I wonder what component of the hot spring water caused it.”
“Indeed. Yubatake water is highly acidic.”
“If that works then Tamagawa Onsen in Akita and Zao Onsen in Yamagata have similar water and would have the same effect.”
“Yay! Let’s go drink some hot spring water!”
It should be noted that whatever chemicals are at work in this water probably also makes it not fit for human consumption. It’s probably also not advisable to inject it into your veins… Just shooting down potential ideas before they happen.
However, as luck would have it, you can create an even more effective corona-killing water using a miraculous substance that’s probably never more than 10 meters away.
▼ Soap!

Yes, ever since medical science stopped attributing illnesses to the moon and witchcraft, soap has been a freaking T-800 when it comes to terminating viruses with extreme prejudice. COVID-19 is no different, and soap is known to kill off well over 90 percent of the virus in only 20 seconds.
Sadly, it clearly doesn’t quite have the same PR machine behind it, since I rarely hear anyone call soap “amazing” or suggest “let’s go drink some soap water.” Thankfully though, this also means there’s no need to make the trip down to Gunma for their magic water when you have something just as good at home.
▼ Soap and Yubatake water together? Just kiss that COVID on your skin goodbye.
However, this is still really good news for Kusatsu Onsen and others like it. Thanks to this discovery, they are planning on setting up natural handwashing springs in three areas around the Yubatake source. It’s just like those bottles of hand sanitizers set up all over the place right now but much cooler, as the sanitizing water will be free-flowing from a natural source, and even after COVID-19, disinfecting natural spring water stands will be a pretty neat tourist draw.
More research is needed to determined exactly which water is effective and why, but it might even have the potential to be bottled and sold as a unique hand sanitizer. It clearly has more appeal than soap and with a little luck, might turn into a helpful source of revenue for Kusatsu too.
Since Japan’s hot springs have been among the hardest hit businesses from the pandemic, this might very well prove effective at protecting their bottom line from the deadly virus as well.
Source: TV Asahi, My Game News Flash
Image: © SoraNews24 (Unless otherwise noted)
● Want to hear about SoraNews24’s latest articles as soon as they’re published? Follow us on Facebook and Twitter!


We go looking for the free kaoyu hot spring facebath of onsen town Kusatsu【Photos】
The 10 best Japanese hot spring resorts locals want to go back to again and again
Traditional hot spring dance reminds us of locker room fights, 3rd degree burns
Japan’s most famous hot spring resort runs ad telling us to go to…a different hot spring resort
Cheap Japanese ryokan at Kusatsu Onsen is hidden at the back of a traditional store
Starbucks Japan releases new sakura goods and drinkware for cherry blossom season 2026
Now is the time to visit one of Tokyo’s best off-the-beaten-path plum blossom gardens
New zombie ship sets sail in Japan, includes Shinkansen tickets and all-you-can-eat sushi
Foreign tourists in Japan will get free Shinkansen tickets to promote regional tourism
What’s up with the secret basement at this Japanese train station?
Super-salty pizza sends six kids to the hospital in Japan, linguistics blamed
Starbucks Japan unveils new sakura Frappuccino for cherry blossom season 2026
Political commentator says Donald Trump supporters whack off to anime 【Video】
We investigate Sendagaya Tunnel and get a message from beyond【Haunted Tokyo】
Japanese beauty magazine asks readers to identify the one crossdresser among 12 beautiful women
Japan’s newest Shinkansen has no seats…or passengers [Video]
Foreigners accounting for over 80 percent of off-course skiers needing rescue in Japan’s Hokkaido
Take a trip to Japan’s Dododo Land, the most irritating place on Earth
Can you eat lunch in Tokyo for less than 500 yen?
A look back on 40 years of Japanese schools banning stuff
New Family Mart cinema opens inside Japanese airport
Japan releases first official sakura cherry blossom forecast for 2026
Starbucks Japan releases new drinkware and goods for Valentine’s Day
Archfiend Hello Kitty appears as Sanrio launches new team-up with Yu-Gi-Oh【Pics】
China’s don’t-go-to-Japan warning looks to be affecting tourist crowds on Miyajima
Survey asks foreign tourists what bothered them in Japan, more than half gave same answer
Japan’s human washing machines will go on sale to general public, demos to be held in Tokyo
We deeply regret going into this tunnel on our walk in the mountains of Japan
Studio Ghibli releases Kodama forest spirits from Princess Mononoke to light up your home
Major Japanese hotel chain says reservations via overseas booking sites may not be valid
Put sesame oil in your coffee? Japanese maker says it’s the best way to start your day【Taste test】
No more using real katana for tourism activities, Japan’s National Police Agency says
Toyama Prefectural University able to locate potential COVID-19 clusters from raw sewage
PPAP’s Pikotaro launches new attack against coronavirus with medicated hand-soap line
2018 Top 20 Day Trip Onsen Hot Spring and Spa Ranking in Japan
The 10 best hotel hot springs in Japan, as chosen by Japanese travelers
2020’s most popular hot springs in Japan, as ranked by Japanese travelers
Several McDonald’s branches closing across Japan due to COVID-19 infections
Oldest ryokan at Japanese onsen resort goes bankrupt due to coronavirus
Kyoto University finds alpacas may hold the key to preventing all COVID-19 variants
Onsen Ramen – Why go to the hot spring when the hot spring can come to you?
18 awesome overnight hot spring trips from Tokyo, and a quiz to help pick the best one for you
Capybara hot springs are back: Rodent-friendly onsen now available all over Japan
Hyotan Onsen – Japan’s only hot spring with three Michelin stars
Tokyo Government considers fining people who knowingly go out when infected with COVID-19
New hot spring found in Tokyo as 80-year-old bathhouse makes a happy discovery
Over 500 karaoke boxes close due to Covid-19, dealing historic blow to the industry
Japan’s hot-spring capital Beppu made quite possibly the best tourism video ever