Cleaning oil soaked and stained wood grips

[Olle]

I have a set of early, oil finished Colt Python grips that I want to clean up, and I have tried the methods described in previous threads on the topic. They are fairly clean now, but there's still some discoloration caused by old oil and grime that has soaked in around the edges and the screw holes. I found a post where somebody got it out of a set of Luger grips by boiling them in water, but I have seen Python grips warp just after using paint stripper, so I don't have the balls to do it. I tried a hot iron and a wet rag instead, but couldn't see a noticeable difference. Are there any other ways to draw the old oil out from the wood?

Also, there's old wood stain on these grips, and I would like to get it off. The paint stripper (Strip-X) didn't do it, and I have also tried acetone and alcohol. Any tips on how to get rid of the stain will also be appreciated.