That depends on what rifle I am shooting, what kind of ignition system I have, and what the weather is doing. For instance...
Winter, #11 caps, traditional rifle, = pure isopropyl alcohol
Summer, #11 caps, any kind of rifle = 50/50 mix isopropyl alcohol/car windshield washer fluid.
Inline rifle, 209 igntion = 50/50 mix, spit patch, any kind of cleaner, or Windex
inline rifle, #11 ignition = mix, or spit patch
Today I was shooting a Knight Wolverine with #11 ignition. I used a simple spit patch because I forgot my mix in the house and was too lazy to walk back in there to get it.