No, it is not safe to use mayonnaise that is over two decades past its expiration date. Mayonnaise typically contains eggs, which are perishable and can pose a food safety risk if consumed well past their expiration date.
The "good thru Jun-98" date indicates that the mayonnaise was intended to be used before June 1998. Using a product that is so severely expired is not recommended as it can lead to foodborne illnesses caused by bacterial contamination.
Expired mayonnaise may have undergone changes in texture, flavor, and color, and the quality of the product would have deteriorated significantly over such a long period. Consuming expired products, especially those containing perishable ingredients like eggs, can put you at risk of food poisoning or other health issues.
To ensure food safety and avoid potential health risks, it's crucial to dispose of any food items that are significantly past their expiration dates. When cleaning out your refrigerator, always check the labels on items and discard anything that is no longer safe to consume. If you have any doubts about the safety of a product, it's best to err on the side of caution and dispose of it.