When shooting a patched roundball or conical you will be able to tell when you need to swab as you will feel the fouling building up in the bore.l So when hunting you might not need to swab as you're only going to be shooting two or three times all day (unless a poor shot or real lucky.. )
When I work up my load I like to swab between shots, no matter what powder I am shooting. Other then APP. I do not swab when I shoot APP in my traditional rifles. I swab my traditional rifles with pure isopropyl alcohol 91%. Then a couple of dry patches. That takes out the fouling and dries in the bore real fast. Then a dry patch or two and I am ready to shoot again.
I have swabbed with Windex or a mix, and spit, water, and cleaners, all of them work. BUT the more water you have in your mix the more you have to be careful to get it all out before you reload. With alcohol that is not as much of a problem as we all know, alcohol will burn.