We have a considerable collection of small items made from Fimo - the plastic clay stuff - things like buttons and badges. They have been hanging around for perhaps 20 years or more - mostly kept in a glass jar. Despite that, we really don't want to throw them away - mainly for sentimental reasons. The problem in keeping them is that they now stink. A horrible "chemical" smell - not that I can identify what might be in the olfactory cocktail. Yet they look perfect.
Is there any way of treating them to kill the smell without affecting their look and feel?