Why does the no pre-rinse rule make my dishwasher smell so bad?

The 'don't pre-rinse' advice is one of the most misunderstood pieces of appliance 'wisdom' out there. Most people hear that and think it means they can toss a plate with half a lasagna into the rack, but that's a fast track to a dead pump and a biohazard in your kitchen. What the manufacturers actualy mean is don't **pre-wash**. You shold definatly scrape every solid bit of food—rice, corn, sauce chunks—into the trash. The detergent needs enzymes to have some proteins and starches to break down, but the machine isn't a garbage disposal. That black slime your partner found is a classic biofilm buildup. It happens when grease and fats from unscraped dishes don't get fully flushed out of the system. If you aren't running your kitchen sink until the water is hot before you start the dishwasher, the machine is likely starting its cycle with cold water. That just coats the internals in a layer of congealed fat. That's exactly where that 'wet dog' smell comes from. It's bacteria living in a layer of grease inside the spray arms and the sump area. You also have to look at the cycle you're using. Most people hit 'Normal' or 'Auto' and call it a day. Those cycles often use less water and lower temperatures to meet energy ratings. If you're leaving residue on the plates, you really need to use the **Heavy** or **Power Wash** cycle along with a high-temp wash option. The higher heat is what actually melts the fats so they can be carried away through the drain hose instead of sticking to the plastic parts.

The middle ground is really the way to go. Scrape the solids off so the filter stays clear, but don't feel the need to scrub the plates until they're spotless. If you're still getting a smell, run a cleaning cycle with a dedicated dishwasher cleaner once a month. Also, check your drain hose setup. If it doesn't have a 'high loop' under the sink, you might be getting dirty sink water back-washing into your dishwasher tub, wich causes that stagnant funk.

So I'm basically a total newbie here, but I always wondered about the filter. Does everyone acutally pull that gross thing out and scrub it? I looked at mine after reading this and it was covered in this weird gray gunk. If I stop rinsing so much, am I going to have to clean that filter like every single day? Also, does it matter if I use the liquid soap or the pods? I heard pods have more of those enzymes but they seem so expensive compared to the big jugs of gel.

You really need to look at your detergent dose. If you're using those massive pods but also rinsing your dishes clean, you’re basically creating a chemical soup that has nothing to eat but your machine's gaskets. That "wet dog" smell often happens because people skip rinse aid, too. Without it, the water doesn't sheet off; it just sits in the crevices and gets stagnant. Switch to a high-quality powder. It lets you adjust the amount based on how dirty the load actualy is. If you're seeing film, bump up the temp and make sure your rinse aid dispenser isn't empty. It’s a total game changer for the smell and drying performance.