The method I use for removing the oil from oil soaked gun stocks is low cost simple and extremely effective. The basis of my method is a heated garden seed propagator with a heat output of 11 Watt’s the cost on this side of the pond of about Ł15, this is used in conjunction with an absorbent clay base cat litter.
The method of use is simple surround the stock with cat litter to absorb the oil as it is driven out by the heat which can take from a few days to a few weeks. Now because the heating element is of such low wattage and spread over a large area it is safe to leave the gun stock in the propagator for extended periods of time, the cat litter absorbs the oil perfectly and if it becomes saturated it is very simple to replace.
In the photo is the propagator with a gun stock so you can determine the size. I have not cleaned it because I removed some seeds that the lady gardener I married was propagating at the time, getting myself in to deep trouble as a consequence.
The other photograph I took at the same time are of some “Opium” poppies that have some colour introduced in to the strain, they are legal to grow in gardens here because we do not have a warm enough climate or enough sun to be able to extract Opium from them. If you look closely though you can see a “Fox glove” this is a wild plant that is at home in a garden or in hedgerows, its Latin name is “Digitalis Purpurea” a plant I keep well away from because touching the leaves can really effect your heartbeat. I better make things right with my wife over emptying the propagator because there enough foxgloves in the garden to kill a couple of hundred people not to mention the “Monks Hood”.