Pre-Rinsing Your Dishes Is Hurting Your Dishwasher's Performance

This is one of those things that sounds completely backwards until someone explains why — and then you can't believe you didn't know it sooner.

A former appliance repair technician and appliance care specialist named Renae has been making the rounds online with a simple message: stop rinsing your dishes before loading them in the dishwasher. Not "you don't have to if you don't want to." Actually stop doing it. Your dishwasher works better with dirty dishes in it.

The reason comes down to something called a turbidity sensor — a feature that has been standard in most dishwashers since the mid-1990s and nearly universal in major brands since the early 2000s. If your dishwasher was made in this century, it almost certainly has one.

Here's how it works. When you start a dishwasher cycle the machine typically runs an initial rinse first. As that rinse water drains the turbidity sensor checks how cloudy and dirty it is. If the water is murky the machine determines it needs to run a longer, more intensive wash cycle. If the water is mostly clear — because you already rinsed everything — the machine concludes the dishes are barely dirty and runs a shorter, lighter cycle.

So when you rinse your dishes clean and then load them, you're essentially tricking your dishwasher into doing a half-hearted job. Then you wonder why the baked-on casserole dish didn't come out clean.

"If you were to load your dishwasher with mostly clean dishes because you rinsed them off, and just a couple of more heavily soiled dishes, the baked-on stuff might not come off," Renae explains. "Because the turbidity sensor didn't detect enough turbidity in the water to run the cycle for long enough."

The correct approach is to scrape excess food off your dishes — chunks and solids, not the residue — and load them directly. Let the machine do the rest. That's what it was designed for.

Why So Many People Don't Know This

Rinsing dishes before the dishwasher is one of those habits that got passed down through generations before turbidity sensors existed. Older dishwashers genuinely did need pre-rinsed dishes to work properly. The habit stuck even as the technology changed. And because dishwashers run with the door closed it's hard to observe what's actually happening inside — so people just kept doing what their parents did and assumed the machine needed the help.

Many people who make the switch report the same experience: they assumed their dishwasher just wasn't very good, only to find that once they stopped pre-rinsing, the machine suddenly started cleaning everything properly. The dishwasher hadn't changed. The information going into it had.

If Your Dishwasher Still Isn't Getting Things Clean

Stopping the pre-rinse habit fixes the problem for most people. But if yours is still struggling after you make the switch, Renae offers a few other things to check.

Run your hot water tap for a minute before starting the dishwasher — this preheats the water line so the machine gets hot water from the start rather than cold water that has to heat up inside. Make sure you're loading dishes according to your manual and not blocking the spray arms or detergent dispenser. Use a quality detergent. And clean your dishwasher filter monthly — most people have never done this and it makes a significant difference.

If you do all of that and the dishes are still coming out dirty, that's when it's actually time to call someone.

For everyone else — scrape, don't rinse, and trust the machine.

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