If you can’t lick ’em, join ’em. Not that many of us lick the mayo knife after applying the goopy goodness to sandwiches. Anyway, for whatever reason, mayonnaise jars (as well as many others) typically have hard-to-reach areas inside of them. The result is wasted food for no good reason. Aside from the occasional squeeze bottle, it doesn’t look like mayonnaise jars are going to change anytime soon, so might as well get on board with them and use something like the Mayo Jar Spreader to put an end to the waste. Also works for sauce jars, in which the makers are apparently in cahoots with the mayo people.
Funny, the product link above didn’t stick around, so here’s a new one: