According to Muzzleloader magazine, it is possible for the 3 solution cleaner consisting of 1/3 alcohol, 1/3 hydrogen peroxide, & 1/3 water-soluble oil to explode.
"Hydrogen Peroxide is considered to be an explosive. The concentration is quite low, (6%), & safe when not mixed with other things. But, over time, & in the presence of a fast burning, low flashpoint fuel (alcohol), it can pose a significant threat."
The issue contains a 1st hand account of an actual explosion, & should be required reading for anyone using &/or considering using the 3 solution cleaning fluid. Apparently the individual in question kept the solution stored in a sealed glass bottle, which exploded, with predictable results. Remember, safety first!