This question already has an answer here:
So I like salsa, but don’t eat enough of it to use it all in a few days. In general, does store bought salsa—that is stored in the supermarket on open shelves without temperature control—go bad even if refrigerated after opening?
I’ve personally used store bought salsa a few weeks after opening and it smelled fine and there was no sign of mold. Was this an error on my part because I’ve never gotten sick from that stuff; just want a more informed answer if possible.