Designing a zero G washing machine doesn't seem that far fetched. It could be solvent based and any residual solvent could be removed via vacuum.
I guess it's one of those things that may already have been considered but then it was decided that it wasn't worth the extra weight and that reusing/dumping clothes was good enough.
I guess it's one of those things that may already have been considered but then it was decided that it wasn't worth the extra weight and that reusing/dumping clothes was good enough.