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Manufacturers universally tell you to refrigerate mayonnaise once opened, though, because it helps preserve the flavor. Warmth causes mayonnaise to break down after a while, and it gets to the point where it just tastes oily. Homemade mayonnaise, of course, is a different matter. With its use of raw eggs, it is highly perishable and should be consumed immediately or refrigerated and finished off very shortly.
Credit: David Curtis age fotostock Getty Images. Cut lemons that aren't refrigerated must be used the same day. If the lemons are cut and placed in the refrigerator, they stay fresh for two to three days. Lemon juice in a resealable container stays fresh in the refrigerator for four to six months. Fresh-squeezed lemonade should be consumed the same day it is prepared if it is not refrigerated. If the beverage is refrigerated, it can be consumed for up to a week.