I use some white "food grade" stuff (I forget the brand) but it's been working great for me. A while back I had a thread about a stuck omega, I had to use a torch to get it off. Someone recommend this stuff and I haven't had any issues since.
The metal based stuff just makes such a huge mess. It gets on the bag, the gun, your hands, clothes, everything. This white stuff doesn't, and wipes away easily.