Neat-freaks! Put down that toothbrush and pick up this nice ESD-safe cleaning brush! If you want to have a nice clean board (or maybe you're doing some repair) you can use this stiff-bristled brush without worries. Some people like to drip a little rubbing alcohol on their PCBs after soldering and then scrubbing to remove rosin/flux. Finally, you have the right tool for the job.
About 7" long from end to end, scrubby part is 1.5" x 0.5" with 0.5" bristles.
"When you make a thing, a thing that is new, it is so complicated making it that it is bound to be ugly. But those that make it after you, they don’t have to worry about making it. And they can make it pretty, and so everybody can like it when others make it after you" - Pablo Picasso