The annual beach clean at Seven Sisters gets under way this month and Sussex Downs Conservation Board wants to boost numbers of volunteers at the event.
The chalk cliffs are formed where the South Downs meet the sea
Last year, 40 large bags of rubbish were collected from the beach and river bank at the famous chalk cliffs.
One exercise led to drums of petroleum jelly being found.
Conservationists said it was "frustrating" the majority of litter was blown or driven up on to beaches at high tide from ships and boats.
The beach clean takes place in April after the winter storms and ahead of the summer season, ranger Valerie Phillips said.
She said it was important work that made the beach cleaner and safer for both visitors and wildlife.
Rangers have found birds that died because of pollution
"Removing all the unsightly marine debris from the strandline and river bank makes an amazing different to this protected and beautiful landscape," she added.
The country park, which wants to see action to reduce pollution at source, said the beach cleans help to highlight "the serious issue of marine and coastal pollution".
This year's beach clean takes place on 17 April.