Susan, here is a picture. I got this at Home Depot. Use it for cleaning and staining wood furniture. It's far more gentle than the ones with the green Scotch Brite. I cut a small piece and boil it in water first to sanitize and then I use them in the brine wash. See below, in package, in close up, and out of package (see the corner I cut to wash one of my cheeses?)
Brie, toothbrush may work... I used mushroom brush before but it was too gentle. Perhaps a rougher bristle would work. This works best.