Recycling gray water is neat, but what if you didn’t–literally–end up flushing it down the toilet? What if, instead, your washing machine could clean and recycle up to 95% of its own water on-the-fly?

Pour vinegar in, run a hot cycle, then sprinkle baking soda and run another—say goodbye to funky smells and gunky residue. Give the drum baffles and rubber seals some love with a toothbrush and soapy ...