A picture of shredded and 'razor-like' drinks cans has been shared to serve as a warning to careless litter bugs.
The discarded cans were torn up after the grass along the picturesque river was cut, with the cans being left to resemble razors and posing a threat to wild life.
Mr Brown said: "The grass along the path has been cut along with any litter that shouldn’t be there, resulting in shredded aluminium drinks cans and broken glass and plastic bottles.
"These shards of aluminium are sharp like a razor.
"The danger here is an injured dog with cut paws and a costly vet bill, not to mention the wildlife suffering needlessly or a sandal or flip flop wearer slicing their foot."
Mr Brown asked people to be "responsible for your own litter and either put it in a litter bin or take it home".
Mr Brown shared pictures of the dead animals on Facebook as a wake up call to people so they stop and think before throwing rubbish on the street.
Volunteer members of Mr Brown's litter picking group were responsible for clearing away Greatstone beach after thousands of people descended on it earlier this month for a cook out.
People arrived on coaches and in private cars and minibuses to spend a day at the seaside. But they caused traffic and parking chaos, created noise pollution and social distancing fears and left behind copious amounts of litter.
Four police officers were also hurt - one hit by a car - and a man has since been charged with dangerous driving and actual bodily harm, and is due to appear at crown court next month.
More than 400 bags of litter were collected from the sand and surrounding streets the day after the Greatstone party by the volunteers.