NO MATTER how many times it's said, some Clarence Valley residents never learn.
"Dirty nappies are not recycling," Grafton Regional Landfill manager Colin Polsen said.
While many do the right thing when it comes to separating general waste from recycling, Mr Polsen said there were still those who didn't.
"I think some people do get confused with things, like polystyrene has a recycling symbol on it but we don't have the facilities here for it, so here that should go in the red bin," he said.
"But things we often see are clothing, footwear, chains, car parts, fishing line, tarpaulin - they're not recyclable."
He said since the yellow bins increased in size, he had noticed a difference in people making better decisions.
"People are recycling more, which is great, but people need to do better, they really do," Mr Polsen said.
"I think people put things in the bin and think it's out of sight, out of mind, and don't realise what we do out here.
"All the contaminants have to be picked out."
Mr Polsen said people also need to remember to empty liquids out of containers.
He thanked those who did the right thing.
"On a whole, people do pretty well," Mr Polsen said.
"It just takes that one person to empty their lawn mower clippings into the yellow bin and it goes through everything."
What you can recycle:
Glass bottles and jars
Plastic containers such as ice cream containers, milk bottles, etc