I’m sure that any object rattling around with your laundry in hot water is going to help knock the dirt and oils off of them. I think it would be an interesting experiment to try them out with different solvents amd see how they work. I agree with the fact we over sanitize; your immune system is like anything else, you don’t use it you lose it. Going alkng with this philosophy I keep the volume on tvs and music down and I try to read at varying distances in varying light levels. Its like going to the gym to work out your muscles. Every system in your bidy needs exercise. Thanks for another thought provoking post @xyzashu!