Yes, my daughter did this for her fourth grade science project and grew more stuff in her petri dish agar for hand sanitizers, and a little less for antibacterial soap, when compared to regular soap. So there you have it. But be aware that triclosan in antimicrobial soaps reacts with chlorinated water to produce chloroform. In the presence of sunlight the reaction might be producing dioxin. Yes, indeed. No one is safe.