Hard Water This white residue you see is caused by hard water, says Toby Schultz, co-founder and chief executive officer of Maid2Match. Chris Willatt, owner of Alpine Maids, concurs: "Hard water ...
Rinse and air-dry the pieces. You may need to run the humidifier with clean water for a bit to eliminate the leftover vinegar scent. Although vinegar or citric acid helps with the visible ...