I have some spiked hard plastic balls which I think were intended for the dryer. They were about $5 for two from some chinese online retailer. I sometimes use t

I have some spiked hard plastic balls which I think were intended for the dryer. They were about $5 for two from some chinese online retailer. I sometimes use them in the wash (with detergent) when I'm trying to clean particularly filthy items. I don't think they're magic but I assume they assist the cleaning through mechanical action.