dishwasher works well...dishwashing liquid has bleach (they all do), and most dishwashers have a sanitize button...works well for me...been doing it for 4 years, but I only use the sponge on dishes (with an antibacterial soap)...and I use anitibacterial spray and paper towels on the stove, counters, etc. Sponges get thrown away about once a month, but running them through the dishwasher keeps them from getting really smelly in between dishloads!