I found a recipe for a homemade blackpowder solvent, can't remember where but here it is.
Mix up a pint or more of the following: 2 parts hydrogen peroxide, 2 parts alcohol (methyl or isopropyl), and one part Murphy's Oil Soap. Use as a bore solvent and parts wash. Any cuts and abraisions on your hands will be quite antiseptic in the end as well! I find this to be as good or better than commercial solvents, and because it's cheap, one is encouraged to use plenty of it
Mix up a pint or more of the following: 2 parts hydrogen peroxide, 2 parts alcohol (methyl or isopropyl), and one part Murphy's Oil Soap. Use as a bore solvent and parts wash. Any cuts and abraisions on your hands will be quite antiseptic in the end as well! I find this to be as good or better than commercial solvents, and because it's cheap, one is encouraged to use plenty of it