I use PTFE spaghetti tubing from McMaster-Carr. I buy it in bulk and cut the length I want - an inch to an inch and a half lets me reach most joints. Usually, I'll cut one end at an angle, clip the tip of the applicator spout so it is barely open and insert the tubing into the tip for a friction fit. With the small ID, you can squeeze out a small drop or just wick the CA along a joint. Since I use thin CA almost exclusively, I use a smaller ID tubing. If you use the medium or thick CA, you'll need a larger ID. It is completely inert and CA won't stick - any chunks can just be scraped off with a fingernail. When finished, I drop the spout and tubing into a sealable tub of acetone - any residual CA is dissolved and the spout and tubing are clean for the next building session. Cap the bottle with an uncut spout to prevent moisture incursion.
http://www.mcmaster.com/#spaghetti-tubing/=min3fa