Plus, “a dirty dishwasher will use more energy to clean the dishes, adding to your utility bills,” says Rhonda Wilson, the quality lead cleaner at FreshSpace Cleaning in Louisville.

[u407]’s 3D printed Signspinner was created as a clean/dirty indicator for a dishwasher, and at its heart is a mechanism that works a lot like that of a retractable ballpoint pen. Every click of ...