Mold is everywhere, whether you see it or not. If you see mold on top of a sauce, jam, jelly, that means that the whole container is permeated with it. If the mold appears on your salsa more quickly than with other sauces, that must mean that there is more mold present when you bought it. When mold appears on top of something, it should be discarded. The only exception is cheese, when the mold is–usually–the mold that cured the cheese in the first place. In this case it only has to be scraped off.
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