Rather, this posting is about taking care of your tools. Specifically; nibs and brushes.
I keep my nibs cleaned consistently by soaking them in ammonia, which I keep next to my art table within arm's reach. It is a wonderful product that eliminates the buildup of excessive inks. I would not recommend it for brushes, as it is too harsh on the fibers. The amount of ink residue depends on the brand of ink you use: an ink such as Black Magic is mainly water based, so it will rinse out from brushes with minimal effort. Versus an ink such as Pebeo (which is more silicone based), which takes a bit longer to remove residue, but it will wipe away cleanly.
For brushes, I've found that a solution of water mixed with dish detergent works very well to remove ink buildup on brushes. Again....whatever works best for you. By making cleaning your tools a consistent habit, you will save a lot of money over time, because you won't need to buy as many brushes/nibs. The nibs that either warp or split after excessive use, or brushes that lose their finer points, all get rotated to other duties (ie; background textures, dry brush, etc).
Hope these tips helps! :)