Stop Pre-Rinsing Your Dishes (Your Dishwasher Wants Them Dirty)

You finish dinner, carry the plates to the sink and rinse each one under the tap until it's nearly clean. Then you load it into a machine whose only job is to clean dishes. If that has ever felt a little silly, trust your instincts.

With most modern dishwashers, pre-rinsing is wasted time, water and hot water. Here's the free way to get clean dishes without it, plus an optional upgrade box. A fork and a trash can are all you need tonight.

Why skipping the rinse is worth it

Start with your evening. Rinsing a full load by hand takes real time; scraping takes a fraction of that.

Then there's water and energy. A running tap sends a lot of water down the drain, often water your water heater paid to warm, and then the dishwasher washes everything again anyway. According to ENERGY STAR, a certified dishwasher uses much less water than washing the same load by hand, so letting the machine do the whole job is the efficient choice.

There's also a cleaning reason that surprises people: dishwasher detergent is built to work on food. Most dishwasher detergents contain enzymes designed to break down food soil, and many dishwasher makers advise scraping, not rinsing, in their manuals.

The free way, step by step

Step 1: Scrape, don't rinse

Use a fork, a spatula or a used napkin to push leftover food off each plate into the trash or compost. You're removing chunks: bones, crusts, peels, piles of rice, the last bite of pasta. A thin film of sauce or a few crumbs can stay.

If you compost, keep a small container by the sink for scraps. Our guide to composting in an apartment covers how to do it without a yard.

Step 2: Load it the way your manual says

Loading matters more than rinsing. Check your manual's loading diagram (most makers post them online), but the general rules are:

• Dirty sides face the spray. In most machines, plates in the bottom rack face the center, and bowls and cups angle down in the top rack.
• Don't block the spray arms. Tall pans, cutting boards and long utensils poking through the rack can stop an arm from turning. Give each arm a spin by hand before you close the door.
• Don't nest. Stacked bowls and spoons spooning each other in the basket won't get clean.
• Keep the detergent door clear. A big platter in front of the dispenser can keep it from opening.

Step 3: Run full loads

Every run takes a cycle's worth of water and energy, so a full load gets more dishes clean for the same run. If scraped dishes wait a day or two for the machine to fill up, that's fine. Keep the door closed so smells stay put.

Step 4: Pick the eco or normal cycle and skip the pre-wash

The eco or normal cycle handles everyday dishes. Heavy or pots-and-pans cycles are for baked-on messes and use more water and energy. Skip the pre-wash or pre-rinse option unless a load is truly crusted over. Don't worry if the eco cycle runs longer; that's normal.

At the end, choose air-dry or no-heat dry if your machine offers it. Heated dry uses extra energy, and many dishes dry fine on their own, especially if you crack the door open once the cycle ends. Plastics may stay a little damp; a quick towel wipe handles them.

Step 5: Run the kitchen tap hot first

Many dishwashers draw from the same hot water line as the kitchen sink. If the water sitting in the pipes is cold, the machine's first fill will be lukewarm. Run the kitchen tap until the water feels hot, then start the dishwasher. Catch that cold water in a pitcher and use it for plants.

Step 6: Clean the filter

This is the step plenty of people have never done. Many newer dishwashers have a manual filter at the bottom of the tub, under the lower spray arm, that traps food bits. It doesn't clean itself. When it clogs, dishes come out gritty, the machine can smell, and people start pre-rinsing again because they think the dishwasher doesn't work.

Your manual shows how to remove it; usually you twist and lift out a cylinder and a flat mesh piece. Knock the gunk into the trash, rinse the filter under the tap and scrub gently with an old toothbrush and dish soap. Lock it back in place the way it came out. Many people do this every few weeks, and more often in busy kitchens.

Mistakes that make dishwashers look worse than they are

• A clogged filter. A common reason for dirty dishes. Clean it before you blame the machine.
• Overloading. A full load is good; a crammed one blocks the spray.
• Too much detergent. Extra detergent can leave residue and film. Follow the package and your manual.
• Using hand-dish soap in the dishwasher. Never. It makes a mountain of suds that can spill onto your floor.

Hand-washing? Cast iron, good knives, wooden boards and nonstick pans not labeled dishwasher-safe still need it, and so does everything if you don't have a dishwasher. Scrape first, then wash in a basin of soapy water instead of under a running tap.

When the upgrade is worth it (and when it isn't)

You can do everything in this guide with a fork, an old toothbrush and the detergent already under your sink. If your current detergent works, keep using it.

A plastic-free detergent makes sense when you're buying more anyway and want to skip the plastic tub or film-wrapped pods; just make sure it's made for automatic dishwashers. A silicone scraper is worth it if you cook a lot of sticky or saucy dishes, since it clears plates faster than a fork without scratching. A sink strainer basket is the easy win if bits of food keep slipping down your drain during cleanup; empty it into the compost.

For more low-waste cleaning ideas, see our roundup of eco-friendly cleaning supplies and our guide to DIY green cleaning.

The bottom line

Scrape, load it right, run it full on eco or normal, and clean the filter now and then. It's one of the easiest green habits there is, because it's less work, not more. If a tidier scrap container would help, our kitchen compost bin roundup is a good place to look.