Right so, for many sauces i buy, they have a use within 3 days / 4 weeks after opening in the instructions on the back.
For most.. they have an expiry date on the actual bottle and "Refrigerate after opening" on the instructions, with no info on how long i can use it after opening, does this mean, if constantly refrigerated they will last until the expiry date (Which can be well over a year ahead) Despite having opened them a while ago?
Examples : Teriyaki sauce, Honey/Mint sauce, Apple Sauce, Ketchup, Barbecue sauce, sweet/sour sauce, and the list goes on..