I am trying my best to be chemical free. We use vinegar to preserve tomato sauces and pizza sauces for few days/ weeks. How do we preserve other sauces? I was trying carrot sauce, pumpkin sauce and other varieties. With vinegar it doesn't taste good. Even when stored in refrigerator they don't stay long. So what else can I use to extend the shelf life without adding any chemicals?
You may want to look into canning your sauces at home. You could also freeze the sauces in portion sized amounts and only defrost what you will use that day. This would extend the shelf life, but they would still go bad as quickly once they're opened/defrosted.
Unfortunately, there is a reason we use 'chemicals' to preserve food for longer shelf life. The 'natural' options are simply not very good. If you desire a 'chemical-free' lifestyle, one of the drawbacks is that your food will not last as long.