My favorite mug — the one with the thick ceramic walls and the handle that actually fits four fingers — had turned brown inside. Not the coffee. The mug itself. I scrubbed it with dish soap and a sponge every day for a year and the stain just laughed at me. I considered retiring it to the “pen holder” category of mugs.

Then I remembered something my grandmother did. She never used fancy cleaners. She used salt. And it worked in about twenty seconds.

The Salt Scrub Method

Pour a teaspoon of table salt into the stained mug. Add just enough water to make a paste — maybe half a teaspoon. The paste should be gritty and thick, not runny. Take a sponge, a dishcloth, or even your fingers, and scrub the inside of the mug with the salt paste.

The salt crystals act as a mild abrasive that is harder than the coffee residue but softer than the ceramic glaze. It scrapes off the stain without scratching the mug. Ten seconds of scrubbing, rinse, and the brown ring is gone.

I did this on my “retirement candidate” mug. It came out looking like the day I bought it. I felt like an archaeologist who just unearthed a pristine artifact.

The Baking Soda Alternative

If the stain is really stubborn — years of tea tannins baked in — switch to baking soda. Same method: baking soda plus a few drops of water to make a paste, scrub with a damp sponge, rinse. Baking soda is slightly more abrasive than salt and has the bonus of deodorizing.

For the worst stains, sprinkle baking soda in the mug, pour in a splash of white vinegar, let it foam for a minute, then scrub. The fizzing action lifts the stain from the surface. Then the scrubbing finishes the job.

What About Denture Tablets?

Yes, they work. Drop one in a mug full of warm water, let it fizz for fifteen minutes, dump, and the stain wipes off. Efferdent, Polident — whatever brand. This is the ultimate lazy solution. But it costs more than salt and feels weird if you do not wear dentures. I tried it once out of curiosity. The results were great. I still went back to salt because it is already in my kitchen.

The Prevention Move

Now I rinse my mug immediately after finishing my coffee. Not later. Not “when I get around to it.” A five-second rinse while the coffee residue is still wet prevents stains from forming in the first place. My mug has stayed white for months.