Things You'll Need
1 cup white vinegar
Canning preserves seasonal crops and allows homeowners to enjoy them yearlong. Thoroughly cleaning canning jars before each use, however, is necessary for optimum food flavor and sanitary purposes. White film on canning jars is generally due to washing them in hard water. Neglecting to dry freshly washed canning jars before storing them allows evaporated minerals in hard water to settle on the jars' glass surfaces. Unless promptly addressed, these unattractive white deposits become more stubborn to clean over time. Fortunately, a vinegar solution can remove white film from canning jars.
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Fill a 2-gallon bowl with 1 gallon of water and 1 cup of white vinegar. Thoroughly mix the vinegar and water.
Submerge the entire canning jar in the vinegar solution. Let the jar soak for three hours. Vinegar dissolves hard water film on glass surfaces.
Remove the jar from the solution. Scrub the jar's inner and outer glass surfaces with a dish sponge to clean off the loosened film.
Rinse the jar thoroughly under flowing water.
Dry the jar's inner and outer glass surfaces thoroughly with a dish towel.
Wash the canning jar in hot, sudsy water before use.
- North Carolina Cooperative Extension Service; Removing Mineral Deposits From Household Surfaces; Sandra A. Zaslow; March 1996
- Colorado State University Extension; Canning Fruits; P. Kendall; March 2008
- The University of Georgia National Center for Home Food Preservation: Frequently Asked Canning Questions