140kg of marine debris was collected from the beaches of St Agnes and Gugh during last week's Debris for Doughnuts event.
Some 37 adults and children took part in the beach clean, organised by the Isles of Scilly Wildlife Trust, with 25 bags of rubbish collected.
The clean-up was supposed to take place on Samson but predicted high winds on the day meant Wildlife Trust communications officer Nikki Banfield had to come up with an alternative at the last minute.
Rather than postpone the trip, where volunteers were given a doughnut from Becky's Scilly Cakes in exchange for their efforts, they opted for the change of venue.
Nikki explained on the Wildlife Trust's website: "We landed on St Agnes at around 12:00 and quickly split up into five groups; each group taking a section of the Islands to clean, agreeing to meet back at the quay at 14:30 with their bags to load on to the return boat to St Mary’s.
"Becky’s Scilly Cakes did us proud; we had chocolate, apple, jam and custard filled doughnuts and there wasn’t a chance of the Gulls getting a look in."
Back on St Mary's, the debris was collected by a local haulier and delivered to the Isles of Scilly Council Waste Team for disposal.
Nikki added: "I think I can safely say that Debris for Doughnuts was a success and hope that many of our Doughnutters not only enjoyed themselves but will join us again for future events."
Debris for Doughnuts was funded by the HP Beach Clean Up Fund, which awarded grants for beach litter clean-ups on UK beaches where HP cartridges have been found. Thousands were lost following a storm at sea in 2014 and are being found washed up on UK and European coastlines.
The Wildlife Trust explained on its blog: "The grant was applied for and awarded to the Isles of Scilly Wildlife Trust in April 2016 for the purposes of carrying out beach cleans on the uninhabited Islands of Samson & Tean.
"Unfortunately, due to weather conditions this has not been possible (despite a number of attempts) however, the uninhabited Island of Gugh and neighbouring St Agnes, which are important for breeding seabirds, have now benefited from this funding."
The Great Scilly Spring Clean 2017 took place in March, with 288 people collecting 293 bags of rubbish over two weekends.