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About 15 people took part in the two-hour clean-up, including
Katy Rossiter (22, left) and Lara Robertson (31), who pulled rubbish from between the rocks.
Mr Dutoit said places often looked clean until you looked a little harder.
"We want to keep Dunedin clean.
"We want to keep our coastlines clean for us and for the animals we share it with."
It was also a good educational activity as it showed people just how much garbage humans generated, he said.
"If everyone picked three pieces of rubbish off the beach every time they go there, our coastline would be a lot cleaner."