Why put plastic on top rack of dishwasher?

Author: Frida Hauck  |  Last update: Sunday, July 27, 2025

Because plastics have a low melting point, they can soften, discolor, or warp in high-temperature dishwasher settings. The top rack is the best place for plastics. Keep lightweight items secured between the spokes to prevent them from becoming dislodged during the cycle and blocking the water jets or sprayer arms.

Should plastic go on top or bottom of dishwasher?

Plastic items should always be placed in the top rack to keep them away from the heating element on the bottom of the dishwasher. Plastic can become warped if it gets too hot. Ensure plastic items fit securely in your top dishwasher rack and are not small enough to fit through gaps.

What is the plastic strip with a dishwasher for?

This sealant strip is placed on either side of your dishwasher, and creates a bond between the front and the side of the appliance. The strip measures 638mm in length and is there to prevent water leaks, so if yours has been damaged, it's best your replace it.

What happens if you put top rack only on bottom rack?

If you put an item marked "top rack only" in the bottom rack, you may find it has discolored, warped or become damaged by the end of the cycle. Typically, the dishwasher safe symbol looks like a square box with some plates or glasses (or both) inside it.

Why you shouldn't put plastic in the dishwasher?

Poor Cleaning: Plastics may not get as clean in the dishwasher compared to glass or metal. They can trap food particles, leading to residue and odors. Damage to Other Items: Light plastic items can be dislodged during the wash cycle, potentially causing them to become damaged or to damage other items in the dishwasher.

Dishwasher Upper Rack Wheel Repair for Whirlpool & Kenmore

Does putting plastic in the dishwasher release microplastics?

Using the dishwasher is associated with contributors of MP in the environment, to a greater extent if plastic food packaging is used and detergent is added during washing.

Can I put wooden spoons in the dishwasher?

Prolonged exposure to water will damage your wooden spoons, so avoid soaking them in water and never put them in the dishwasher. If the wood absorbs too much water, which can happen in the dishwasher, it will swell and eventually crack. Plus, this appliance's high heat can warp the wood and degrade its finish.

What should go on the top rack of a dishwasher?

The top rack should house small bowls, cups, mugs, and dishwasher-safe utensils, like silicone spatulas and spoons. Thin plastic items (like quart containers and take-out bowls) should live on the upper rack to prevent them from melting.

Can glass cups go on the bottom of the dishwasher?

Glasses are more likely to be chipped or damaged if placed in the lower rack, so we recommend keeping them in the upper rack. Your bowls, casserole dishes, and other similar items can usually fit in either of the corners. Be sure to place them at an angle, facing downward.

Can you put plastic on the bottom shelf of a dishwasher?

Most dishwashers have an exposed heating element at the bottom, designed to heat water and dry the dishes. If plastic falls there, it can melt or warp. This is especially true of takeout containers or any plastic used for pre-packaged food which should never be put in the dishwasher.

Why do some dishwashers need rinse aid?

Rinse aid is a surfactant, meaning it lowers the surface tension of water, so it more easily slides off dishes in the dishwasher. Especially in hard water areas, rinse aid helps prevent water spots from forming on, for example, glasses, plates and cutlery. It also helps dishes dry faster.

Do you take the plastic off dishwasher?

Whether you need to remove the plastic from your dishwasher tablet depends on the product you have bought. As a good rule of thumb, if the tablet comes individually wrapped then yes, you should remove the plastic wrap before using.

Can pyrex go on the bottom rack of the dishwasher?

A: Yes, the glass bottom does fine on bottom rack.

Why should cast iron pans not be washed in a dishwasher?

In general, your pots and pans should stay away from the dishwasher. Non-stick, cast iron, and aluminum pots and pans should never go into the dishwasher. Non-stick coating will wear out in the dishwasher, cast iron will rust and lose its seasoning, and aluminum will be covered in nicks and scratches.

Why are cups not dishwasher safe?

Although it's tempting to put travel mugs and other insulated containers and lids in the dishwasher, the water and heat could damage the seal and insulation.

Should bowls go on top or bottom of the dishwasher?

The bottom rack is where you'll want to put your large, heavier dishware; anything from plates, bowls, and other large items belong on the bottom rack. Platters, dishwasher-safe cutting boards, and other oversized pieces should be placed more towards the sides and back, so they don't block water spray.

Where do you put drinking glasses in the dishwasher?

Fragile items like glasses should typically be reserved for the top rack of any dishwasher. This keeps them away from the powerful sprayer on the bottom of the machine. If possible, angle cups and glasses on the top rack to prevent water from collecting after the wash cycle is complete.

What is the small rack on the top rack of the dishwasher for?

A third rack is a sliding rack located at the top of the dishwasher, that allows for more space and flexibility when loading your dishes. They provide the perfect space for flatware, utensils, measuring cups and much more.

Can you put Tupperware in the bottom of the dishwasher?

Place Tupperware on the top rack of the dishwasher. This prevents it from touching the heating element at the bottom, which can cause the plastic to warp or melt. Avoid using the heated dry cycle. The high heat can also cause some plastics to melt or deform.

What do you put on the top and bottom of a dishwasher?

Dishwasher-safe plastics also belong on the top rack, away from any heating element, which can cause damage. Plates, serving bowls, and other large items belong on the bottom rack.

What cannot be washed in a dishwasher?

Stop Putting These Things in the Dishwasher
  • Knives, Blades, and Sharp-Edged Tools.
  • Pretty Much Any Metal Except Stainless Steel.
  • Fragile Plates, Delicate Glassware, Fine China.
  • Anything Wood.
  • Anything Mechanical.
  • Natural Stone (Marble, Granite, etc.)
  • Some Plastics.
  • Anything With a Hollow Handle or Thermal Insulation.

Should you put knives in the dishwasher?

High-quality kitchen knives do not belong in the dishwasher.

Although the damage is often not immediately visible, the dishwasher will dull your knives over time. The detergents in the machine attack the blades. They contain salts that contribute to corrosion and thus to wear and tear on the knife blade.

Can nonstick pans go in the dishwasher?

3. Nonstick pots and pans. Unless the manufacturer specifically states that an item is dishwasher safe, do not put cookware with a nonstick coating in the dishwasher. Over time, the dishwashing process can break down the coating, causing it to flake off during cooking and ruining the nonstick finish.

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