[totallynotcool]

In sterile processing we toss brushes, albeit not exactly a sponge, daily- if not more often- because of the bio-burden/micro-organism build up and efficacy. At home I'm a bit more relaxed as most utensils are only touching semi/non-critical tissue but i try to stay clear of anything that holds moisture for cleaning; unless I'm using it with a disinfectant ala bleach.