1. You can freeze it in the refrigerator. Uneaten spaghetti sauce sealed with plastic wrap and refrigerated, can be placed in the refrigerator for about a month or so, but does not and is recommended to eat.

2, add salt. You can add some salt for preservation, most of the pickled products preserved for a longer time most of the reasons are because the salt is too high, can inhibit the growth of microorganisms.

3, into the jar. You can put the extra sauce into the jar sealed preservation, so that the preservation time is also a little longer