How do I keep a clean recycle bin for organic material?
You could put your organic matter in a sealed bucket  and then only transfer it to the the green bin the nite before the collection day. Or you could build or buy a compost bin and put some of your organic matter in that and let the maggots do what they do, break it down into an excellent compost for gardening etc. 

HOW TO COMPOST FOOD SCRAPS