Just neglect. Once you get it up and running again you may want to use one of these with the simple green, windex, water solution in it. You can spray it direct into the brush after every color and to do final clean up. Nice as you can add pressure and spray direct into the pick up while brush is wide open, or into and thru any clogged internal parts like the cone and such. It makes it very simple. I aim it into a 5 gal. bucket of warm water. I also have Q-Tips available too for pick up tube cleaning. I also take apart brush after end of every session and clean. IMO it is a must. Then lube moving parts and reassemble. I really don't see the need for any brushes and such for cleaning. If you do this every time you should have no problem in the future except for worn parts. Parts do wear out with normal use and need replacement, cones, o rings, needles.
http://www.usplastic.com/catalog/cat...me=6252&Page=1
Lube
http://store.spruebrothers.com/share...rce=googlebase