Snakes are a quick and easy "cleaning in the field" and they are easy to carry.
Rods, brushes and slotted tips are needed for more detailed cleaning .
I keep both around.
You can do a lot of cleaning with good old WD40 or Kroil .
My favorite heavy duty cleaner is a home brew called Ed's Red Bore Cleaner (search the term for recipe ).
The new Hoppe's Elite Bore Cleaner has pleasant smell....but it's pricey, my wife doesn't mind the smell ...if that's an issue.
Letting any bore cleaner , WD40 , Ed's Red, Kroil or any penetrating oil , soak long enough to get under the fouling is the secrete to cleaning.

I sometimes question the value of these horribly expensive cleaners...are they really worth it ?
Gary