It’s been a long day of canning. You pull your last round of jars out of the canner and notice that they all have funky spots on them. There might even be a rough, funky film on the outside of the jars. You might be asking yourself if your jars are ruined.
Happily, the answer to that panicky question is no. Your jars simply have acquired some mineral deposits. This happens either when you’re canning in hard water or when your canning pot/rack is starting to break down.
The easiest way to avoid these spots and deposits on your jars is to add some white vinegar to your canning pot. I tend to use about a cup per canner load. It keeps the jars sparkling clean.
If you forget to add the vinegar, you can typically wash those spots and film off the jars once they cool. If it’s particularly strong film, you can fill your kitchen sink with warm water and a cup of vinegar and soak the jars for a few minutes. Give them a good rub with a rag or sponge and them let them dry. Should be good as new!
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