I've been noticing for months that after washing glasses in the dishwasher, they're left with those white spots that won't come off even if I scrub them. My friend says it's because of hard water, but I don't really understand what that means or how I can fix it without spending a fortune on a water softener.
vinegar works but it's temporary and the spots come back, the better option is to put dishwasher salt in the salt compartment because that actually fixes the problem at the root without spending extra money on anything. if your machine already has that compartment (almost all of them do) just fill it up and you're done, it costs next to nothing and saves you the hassle of cleaning glasses every other day.
The most straightforward thing is to use white vinegar in the final rinse cycle of your dishwasher or pour it directly into a container inside the machine. Those spots are mineral deposits, mainly calcium and magnesium, that stick around when the water evaporates. Your friend is right about water hardness: it means your water has a lot of dissolved minerals in it, which is super common in most places. It's not bad for your health, but it does leave that sticky stuff on glass and steel.
Vinegar works because it's acidic and dissolves those minerals without you having to spend money on expensive equipment. Try first by filling a cup with white vinegar and putting it on the top rack of your dishwasher during a normal cycle with no dishes, or if you want something less strong, pour half a cup into the rinse aid compartment. You can also manually clean the glasses with a cloth soaked in vinegar after washing them if you want faster results in the meantime.
Another cheap option is to use lemon or citric acid that they sell in small packets - they work just as well as vinegar. If you eventually decide to invest in something more permanent, water descalers don't always need to be complicated installations: there are relatively affordable filter cartridges for your faucet or small systems that connect easily. But honestly, vinegar solves the problem for a fraction of the cost.
Your friend is right, it's calcium and magnesium dissolved in the water that stick on when it dries, so basically you're seeing the minerals that the water brings. The same thing happened at my place and white vinegar works pretty well - I pour a small glass of it in the bottom tray of the dishwasher before starting the cycle and the stains reduce a lot, though they don't disappear completely. If you want something stronger without expensive descaler, you can also try powdered citric acid (they sell it at supermarkets), it's cheaper than brand products and does pretty much the same thing as vinegar. The other option is to dry the glasses by hand when they come out of the machine, but yeah, that's kind of tedious.
Those spots are mineral deposits that dry on the glass, so your friend is onto something. If you don't want to invest in a professional water softener, what works for me is pouring a splash of white vinegar into the rinse aid compartment of the dishwasher (or directly into a cup inside the machine) every two or three loads, and also make sure you're using regenerating salt in the corresponding compartment if your dishwasher has one. Combining those two things should get rid of the problem pretty well, because the salt works on the water coming in and the vinegar cleans what's already built up.
Dishwasher salt is your best friend here. What you're seeing is precipitated minerals (calcium and magnesium mainly), and while vinegar works, it's more of a temporary fix. The reusable salt that comes with pretty much any modern dishwasher is specifically designed to exchange those minerals for sodium, so it actually solves the problem at the root without costing you much extra.
Look, most machines have a special reservoir (usually under the bottom basket) where you add the salt. You just refill it every few weeks depending on your water hardness, and you're good. The machine uses that salt during the regeneration cycle to clean its own internal system, so not only do your glasses come out spotless, but your dishwasher lasts you way longer. If yours doesn't have a salt compartment, then yeah, you've got a basic machine and that's when vinegar or specific products are your option.
If you use vinegar or home remedies you're just gonna be cleaning the glasses every time, but the real solution is regenerating salt in the dishwasher - that actually tackles the problem at its root, not just the appearance. I do it that way and they stay clean way longer, plus the salt costs almost nothing compared to any other option.
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