For lead bullets/powder/primer fouling-- not copper or plastic fouling.

6oz rubbing alcohol
1/2oz Simple Green
1/2oz Rain Dance car soap
1/2oz Murphys Oil Soap

I used my wife's empty yellow "I Can't Believe It's Not Butter" spray bottlethat has a blue nozzle cap & holds eight ounces. Poured the alcohol in first - then real slowly poured the rest with a funnel. After I got it all in - Ishook it well. You can use a Fantastik, Windex... any kind of spray bottle with a wide misty spray.

Works fine for cleaning MLs!