The cleanup effort started at Bangor's Second Street Park. Volunteers also cleaned up trash at a park on Court Street in Bangor.
The melting snow revealed that local parks were littered with food wrappers, clothes, needles, and even unwanted furniture.
"We just want to make sure that everyone is safe and that they don't have to look at a bunch of garbage when they come to the park with their children or bring their pets," said volunteer Heather Keaton.
The cleanup effort was started to clean up needles, but volunteers quickly realized trash was the bigger issue.
"I wish we had a time lapse - like a before and after," said volunteer Zach Campbell looking around Second Street Park. "But with ten bags of trash the park looks a lot better."
"It's just good to get out here and be proactive and get a good jump start on making sure the parks are safe," said Campbell.
For some of the volunteers, the cleanup effort was personal.
One woman - who overcame addiction herself - said she used to live up the street with her daughter.
"We came to this park almost daily when my daughter was a little baby," said volunteer Evangeline White. She said she used to find needles in the park when her daughter was playing.
During Sunday's cleanup, only one needle was found. Volunteers said they found dozens last year when they held a similar cleanup event, so they hope it's a sign addicts are getting the help they need.
The Socialist Party members said the cleanup efforts were not political, and they want to see more people volunteer when they have another park cleanup next Sunday.
"I would hope that what we're doing today will definitely encourage people to help keep the parks clean," said Keaton.
Any needles the group found during their cleanups were taken to Health Equity Alliance, where they'll be properly disposed of.