Some good info for back-of-the-safe pieces that never get used.
NRA Family | 6 Tips to Prevent Gun Rust
But for those that get used regularly, I found this test at Brownells particularly enlightening
https://www.brownells.com/aspx/learn...aspx?lid=12616
The cheapest, most readily available products work the best, hands down, while the expensive high-end novelty brand names are the worst!