Train staff – with one wearing a Southern Rail fleece and another wearing a Southern Rail badge – can be seen tipping a bucket of water around the homeless man as he lays outside Sutton station.
Southern Rail’s parent company GTR said they are “aware” of the video and are taking it “very seriously”.
Homeless charities slammed the scenes which they described as “heartbreaking” and “terrible”.
Witnesses also described the video – which has been shared on Facebook thousands of times – as “disgusting” after the homeless man gets left soaked in soapy water.
““In terribly cold conditions, to have water poured on you and be pushed by a mop is unconscionable”
Sutton Night Watch Homeless Charity
The clip begins with the man with his belongings laying beneath an information sign outside the station in Sutton.
Water filled with suds can been seen on the pavement, before one of the workers dumps another bucket load near him offscreen – with the water flowing onto the man.
The homeless man fidgets and shares a few words with the Southern worker, who then dumps another load of water next to him.
People can be seen walking past, and the woman behind the camera says “absolutely disgusting behaviour from another human being” and “he is throwing water all over the man”.
Sutton Night Watch Homeless Charity reacted to the video on Facebook.
The organisation said: “We have been informed it is Southern Rail staff and one of our service users at Sutton Station.
“You can clearly see the terrible treatment of a human being.
“In terribly cold conditions, to have water poured on you and be pushed by a mop is unconscionable, worse still we know this gentleman is diabetic.
“We have contacted the local councillor and an email has been sent to the chief executive of Southern Rail.”
Another homeless group, Kitchen for Everyone, also shared the clip on their Facebook.
It wrote: “As human beings how could they treat a fellow man like this?
“This world truly saddens me at times, to pour water on someone because they don’t fit your ‘ideal’ is beyond me.
“Whilst I would have been helping this man and wouldn’t have thought to video it I am so glad it has been videoed to show what happens in this country in 2019.
“Homeless services in that area have been made aware as have Southern Rail who have commented to say they’ll be looking into the incident.
“I hope the man in question will be taken care of and given new clothes, apparently whatever was in that water has discoloured his clothing.
“Truly truly heartbroken that anyone could believe this is acceptable behaviour.”
Shocked viewers said: “What a disgrace, that poor man has nothing and you wet all his belongs. Hope you rot in hell.”
Others added “absolutely disgusting” and “vile humans”.
Another said: “Disgusting treatment of a human being down on his luck.”
A GTR spokesperson said: “We are taking this very seriously and are in the process of conducting an internal investigation in regards to the online video.”