I always thought I would use one of those if I made a holder of some sort for the chip. Perhaps burring some holes in a cutting board the diameter of the chips. Then you could just set them and go over then with the brush. Since I can only brush less than half the chip anyway because I have to hold it with my other hand, I hold the toothbrush in my hand with my thumb behind the head and brush away and at the chip...getting into to those little hat and cane crevices. I find this puts less stress on my hand and I can go much longer without feeling wore down. I wear magnified reading glasses to also monitor my progress.
There is no doubt an ultrasonic cleaner is much easier...but I actually enjoy this process. It's kind of therapeutic.
I am however going to order one of those nail brushes though and try it out. Thanks for the idea Trihonda!