Once it is absorbed in to the plastic, there is little chance you will get the smell out all the way. I am a plastics engineer in real life, I have used material that is reprocessed milk containers. This material have been cleaned, ground, melted at 400 plus degrees, pushed through an extruder, peletized and still smells of spoiled milk. On the plus side, when we are proceesing it, the whole place smells like cheese.
Plastics are very porus, you can kill the germs on the surface but that which gets in to the material is there until you heat it up and it will still have the odor
Where you are is where you belong, it is where you are going that you can change