Finally figured out why my dishes were coming out filthy

I ran into something similar but it wasn't the filter blockage, wich was what I first thought it was. My unit is a Kenmore, and after about two years, the dishes started looking cloudy, even though I was running the hottest setting available. It turns out the issue wasn't just grime, but scale buildup, which is totally predictable in our hard water area. I noticed white crust forming around the little holes on the lower rack spray arm, almost like limescaling. I stopped trying to scrub it and instead poured a cup of white vinegar into a bowl and placed it in the top rack, then ran a full cycle with the door closed, no dishes inside. It wasn't a glamorous fix, but it seemed to break down the mineral deposits that were blocking the jets. The next load felt much better, and the rinsing was significantly cleaner. It took a while for it to fully clear out, but that vinegar soak defintely helped.

I had a similar issue with cloudy glasses in my Bosch dishwasher, but for me it wasn't just about the crud in the filter. Even after I cleaned the spray arms and checked for scale like the other person did, I kept getting stubborn streaks and white residue on my glassware. It took a while to realize the problem wasn't the clog, but the way the water was drying on the dishes. I decided to experiment with a dedicated rinse aid, specifically a brand like Finish, since my usual soap didn't seem to be doing the trick anymore. What made the difference was the way the rinse aid interacted with the rinse cycle. My unit had a setting that was sometimes skipped, which I learned was crucial for getting those hard water spots off. Once I forced it to use the highest temperture and made sure the rinse aid was properly dosed in the dispenser, the streaky problem disappeared almost immediatly. It felt like a tiny detail, but for stainless steel appliances, that extra step makes a huge difference in appearance. It’s not about the grime, it’s about the final wash.

I ended up running it with a more effective detergent, but the rinse aid adjustment was the real breakthrough for clear dishes.

Something else that trips people up is the detergent itself, specifically pods in short or eco cycles. I spent ages wondering why my plates had a gritty film until I opened the door mid-cycle once and found the pod still sitting half-dissolved in the dispenser. The water never got hot enough, or the cycle was too short, for the wrapper and the block to break down properly. I switched to powder, dosed it light, and the difference was immediate. Also, running the hot tap at the kitchen sink until it runs warm before starting the machine seems to help the first fill come in at temperature.

I get why people suggest the vinegar bowl thing but I don't think it does much. One cup sloshing around in ten or more gallons of water gets diluted to basially nothing, so the wash itself is nowhere near acidic enought to eat off scale. When my old machine had hard water crust I pulled the spray arm and soaked it in a bag of vinegar right in the sink, which is way more concentrated. Also check how much detergent you're using, becasue with hard water more soap just means more film.

One more thing to add to the pile, loading matters more than I ever thougt. I was stacking my bowls facing the back out of habit and they were pooling water like little cups. Once I angled everythign down and stopped nesting things togehter, half my 'dirty dish' problems vanished. Also, run the kitchen tap till it's hot before starting the cycle. Sounds dumb but if the machine fills with cold water it never gets up to temp fast enough to work right.