Was warned by dishwasher repairman that this really isn't a good idea because there is often enough hand dishwashing soap remaining in the sponge to make too many suds, make dishwasher inefficient, &/or cause harm to the works of the dishwasher, unnecessary repairs or shorter dishwasher life. I now put mine in the clothes washing machine w/ a load of kitchen towels that are bleached. Air dry (been known to throw them in dryer--oops -- could be a fire hazard).
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