Lighter fluid, acetone, benzine, and other light weight extremely flammable vaporous fluids worry me. I have some of them, but don't really like to use them for cleaning if I can avoid it. Perhaps in this case I'm just being paranoid.
I do use the denatured alcohol and that is also flammable. But at it's rapid rate of evaporation the vapors don't pool in an area as bad. And I only use a cap full at a time. When I use a q-tip and clean a part it's dry by the time I reach for another q-tip.
Hoppe's #9 is a heavier oily chemical and although it has a distinctive odor it's not near as vaporous as the others. And it works.
It's job is to cut through oils, grease, carbon and to a lesser extent metallic fouling. I've used it for many years.
Joe