Yes I will give them a go. The thing is though, the chap who did the refinishing of the gun did warn me off using any kind of spray oil on the stock i.e legia spray etc as they contain chemicals that would break down the oil finish he had applied so iv been following his advice. The only thing it’s had is a couple of coats of Liberon Clear Black Bison Polish as it was what I was advised to use so the stock wasn’t oily nor sticky. It is certainly definitely attracted to something on the wood though as it is very keen on staying.I suspect (without knowledge) that it's adhered due to oil and not bonding through the ink itself.
Clay bar (as already mentioned) or even some simple childrens plasticine may show the answer.