Pam Sojda at Offhaus Farms in New York State offers this convenient tip to make sure your wash water is hot enough. Start with an inexpensive rapid-read thermometer — they have a probe of about 4 or 5 inches long. Cut a 1-inch square of Styrofoam from some packing that you have received recently. Press the thermometer probe through the center of the square. Now, you have a floating thermometer to monitor wash water temperature in your sink. Mark the thermometer with a permanent marker at the 120 degree mark so it is easy to see when water temperature has dropped below 120 degrees, at which point the water is not hot enough to do an effective wash. No excuses now for having water that is not hot enough!