I took an orange to work inside a polypropylene food storage box, and then (ahem...) forget about it for a couple of months. Upon rediscovering it, I threw out the mouldy remnants of the orange and washed the box thoroughly.
However, the plastic seems to be permanently tainted: if I put the lid on the box for a few hours, there is a clear smell of over-ripe citrus fruit upon opening. This smell/taste will even pass into food that is stored in the box.
I have washed the box many times, including putting it through a dishwasher, but the problem persists. Is there anything I can do to remove the orange 'flavour' from this box, or does it need to be discarded?