Have you ever loaded your dishwasher only to hesitate, wondering if you can safely include your plastic containers? What with lunch boxes, freezer containers, baby bottles and dozens of other plastics, it’s no wonder we’re asking these questions.

With this uncertainty in mind, let's examine the world of dishwashing plastics, unravelling the myths and providing you with practical advice to keep your kitchen routine safe and efficient.

Is It Safe to Put Tupperware in the Dishwasher?

Tupperware has been a kitchen staple for decades, prized for its durability and convenience. But can it withstand the heat and pressure of a dishwasher? The answer is, it depends. Most modern Tupperware products are designed to be dishwasher safe, but it's always best to check the manufacturer's guidelines. 

Here are our top tips:

1. Check that the Tupperware is dishwasher safe. Most modern Tupperware containers made after 1979 are dishwasher safe but always check for a dishwasher safe symbol or label on the bottom of the container.

2. 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.

3. Avoid using the heated dry cycle. The high heat can also cause some plastics to melt or deform. Let the dishes air dry instead.

4. Tupperware made before 2010 may contain BPA. BPA is a chemical that some studies have linked to health issues. Tupperware made after 2010 is BPA-free.

5. Hand wash any Tupperware that doesn't explicitly say it's dishwasher safe. Thinner plastics or containers without the dishwasher-safe symbol are best washed by hand.

Can You Put Microwavable Plastic in the Dishwasher?

Microwavable plastic is another common item that people often wonder about. These plastics are generally designed to withstand higher temperatures, making them safer for dishwasher use. However, just because a plastic container is microwavable doesn't necessarily mean it's dishwasher safe. Always look for a dishwasher-safe label or symbol on the plastic. If it's not clearly marked, hand wash the item instead.

What Plastic Material is Dishwasher Safe?

Not all plastics are created equal, and some are better suited for the dishwasher than others. Plastics labelled with recycling codes 2 (high-density polyethylene, HDPE), 4 (low-density polyethylene, LDPE), and 5 (polypropylene, PP) are generally considered safe for dishwasher use. These materials are more resistant to heat and chemicals, reducing the risk of damage during the dishwashing process.

Dishwasher Safe Markings

• A square symbol with a plate or plates and water droplets or diagonal lines represents dishwasher safe. If the water only hits the top of the plate, it is top-rack safe only.

• Rubbermaid uses a symbol with a plate and bubbles, along with text saying "dishwasher safe" or "top rack".

• Some plastics have a recycling symbol with the number 5 inside, which indicates polypropylene plastic that is generally top rack dishwasher safe.

However, these symbols are not universal. Many plastics do not have any markings at all. The best way to determine if a plastic item is dishwasher safe is to:

1. Look for one of the dishwasher-safe symbols on the bottom of the item.

2. Check with the manufacturer, as they can specify which plastics they have treated to withstand the heat and detergents of a dishwasher cycle.

3. Err on the side of caution and hand wash plastics without clear dishwasher-safe markings to avoid potential warping or chemical exposure from high heat.

Can I Put Plastic Baby Bottles in the Dishwasher?

When it comes to baby items, safety is a top priority. Many parents are concerned about whether they can put plastic baby bottles in the dishwasher.

The good news is that most modern baby bottles are designed to be dishwasher-safe. This makes cleaning them easier and ensures they are sanitised properly. However, it is wise to place the bottles on the top rack and use a gentle cycle to avoid any potential damage. Additionally, always check the manufacturer's instructions to ensure the bottles are dishwasher safe.

How Do I Know if Something is Dishwasher Safe?

Determining whether an item is dishwasher safe can sometimes be tricky, but there are a few guidelines you can follow:

1. Look for Labels: Many plastic items come with labels indicating whether they are dishwasher safe. Look for symbols such as a dishwasher icon or the words "dishwasher safe."

2. Manufacturer’s Instructions: Always refer to the manufacturer's instructions. If the item came with a user manual, it would often include information about dishwasher safety.

3. Top Rack Safety: As a general rule, if a plastic item is dishwasher safe, it's best to place it on the top rack. This reduces its exposure to the high heat at the bottom of the dishwasher.

4. Test First: If you're unsure about a plastic item, try washing it on the top rack on a lower heat setting the first time. Check for any signs of damage before including it in regular dishwashing cycles.

Are Food-Grade Plastics Dishwasher Safe?

For the most part, food-grade plastics are safe to pop in the dishwasher. However, there are some important points to note:

• Polypropylene (PP) is the most common food-grade plastic used for containers and lids. It is top-rack dishwasher safe up to 210°F.

• Plastics with recycling codes 3, 6, and 7 (corresponding to phthalates, styrene, and bisphenols) should be avoided in the dishwasher as they may leach chemicals.

• Always check for a "dishwasher safe" label or symbol on the bottom of the plastic container. If it doesn't explicitly state it's dishwasher safe, hand wash it instead.

• Avoid using the heated dry cycle. Let plastics air dry instead.

• Over time, even dishwasher safe plastics will show wear and tear, so it's best to replace them periodically.

Practical Tips for Dishwashing Plastics

To ensure your plastic items stay in great condition, here are a few practical

tips:

• Avoid High Heat Cycles: High heat can cause plastics to warp or melt. Opt for lower heat or gentle cycles when washing plastic items.

• Secure Lightweight Items: Lightweight plastic items can be tossed around during the wash cycle. Use a utensil basket or a similar device to secure these items.

• Rinse Before Washing: Food particles can cause plastic items to discolour or retain odours. Rinse plastics thoroughly before placing them in the dishwasher.

• Check for Damage: Regularly inspect your plastic items for any signs of wear and tear. Damaged plastics can release harmful chemicals when heated.

Choosing a Dishwasher with Multiple Settings for Safety and Longevity

If you’re keen to keep your family safe and ensure your kitchen products stay in top condition, choosing a dishwasher with multiple settings is key. Defy dishwashers offer a variety of customisable options, allowing you to select the perfect cycle for delicate plastics, sturdy cookware, and everything in between. 

With settings like eco-wash, quick-wash, and heavy-duty, you can ensure that each load is treated with the care it needs. By using the appropriate settings, you not only extend the life of your kitchen items but also keep your family safe from potential hazards.

Summing Up

Understanding which plastics are safe to put in the dishwasher can save you time and keep your kitchen items in good shape. By following the guidelines and tips provided, you can confidently include plastics in your dishwashing routine without worry. Remember, always check for dishwasher-safe labels and follow the manufacturer's instructions to ensure the longevity and safety of your plastic items.

Whether it's Tupperware, microwavable containers, or baby bottles, knowing the dos and don'ts of dishwashing plastics helps maintain a clean and safe kitchen environment. Happy dishwashing!