For some reason, every single microwave-cleaning how-to we’ve published includes the use of a lemon, or lemon juice. This isn’t all that shocking; the citric acid in lemons has anti-microbial properties, and lemons make things smell good. Somewhat paradoxically, they’re also loved by the “chemical-free” crowd (even though fruit is incredibly chemically complex), and they just feel wholesome and natural, which is why lemon water feels more healthful than plain water (it’s not).
Microwaves get gunky and stinky real quick, so the inclusion of a fresh-smelling, acidic lemon is quite natural—but it is not necessary. The only thing you need to clean it is a bowl of water, and maybe some elbow grease if it’s really nasty. Put about half a cup of water in a bowl, then place that bowl of water in the microwave, nuke it for three minutes, and let the steam dissolve caked-on gunk, grime, and grease for an additional five minutes. Wipe all that stuff out, and give the rotating plate a quick scrub in the sink, and you’re done.
If you’re worried about missing out on citric acid’s anti-microbial properties, don’t be. Though some of the acid from the lemon does get released into the microwave, not a lot makes its way onto the surfaces, and it’s the hot hot steam that’s doing most of the heavy lifting in that regard anyway.
Can a lemon help your microwave smell a little better? Yes, but so can plain vinegar, and so can the simple act of steaming and wiping out a bunch of gunk that’s been sitting there for weeks. If your microwave is still a bit stinky, you can wipe it down with a bit white vinegar—or use a lemon if you really want to. But you do not have to use a lemon to enjoy a clean microwave. Rely on the power of steam, and use that lemon for something fun, like a cocktail.