My local surplus store got in a lot of 6 oz cans of G I bore cleaner,on the can has purchase order 43-18171.do you guys think it is OK to use it on my Garand and M14,or any other firearm for that matter? I read that it is good to clean up after corrosive ammo.(I know, don't use corrosive ammo). any other uses? It's in the small O.D. can. I also read that it is WW2 era stuff. what do you guys think?