People who leave non-recyclable materials in their blue bags will not have them collected.
Guernsey Waste says the contamination of blue bag recycling is an increasing problem.
Blue bags are designed for washed out food containers, milk cartons, plastic pots and tin cans.
But kerbside collectors say more people are abusing the system by not washing out food residue and putting things like crisp packets, clingfilm and food wrappers into the bags.
The problem is that these items 'contaminate' the recycling piles, meaning that waste has to be sifted out at the depot and this adds cost to the process.
Parish kerbside collectors are now leaving obviously contaminated blue bags where they are.
Guernsey Waste manger Rachel Lowe says they need to get the message across to people:
"If you put out the wrong materials for collection and they still get picked up, you naturally assume you have put in the correct items.
"The only way to break the cycle is if it gets left behind.
“We hope that will very quickly get the message across about thin film plastics and other contamination, without causing anyone too much inconvenience.”
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