Short Answer? Yes. But only if it’s the right kind of plastic. Some plastics handle the heat just fine, while others can melt, warp, or seep chemicals you definitely don’t want near your food. The key is knowing about dishwasher-safe and how to load it properly.
If you’ve wondered what counts as dishwasher-safe plastic or how to wash plastic in the dishwasher without wrecking it, you’re in the right place. Let’s talk about the symbols, the resin codes, the common mistakes, and when it’s just better to hand wash.
Check for the Dishwasher Safe Symbol First
Before tossing that container in, flip it over. Most dishwasher-safe plastics are clearly labeled.
Common Symbols:
- Dishwasher Safe:
A square with water droplets or dishes is safe for both racks.
- Top Rack Only
Same symbol but marked as ‘Top Rack’. These plastics can’t handle high heat.
- Not Dishwasher Safe
Either a crossed-out icon or no symbol at all. You should hand-wash these.
In Canada, plastic containers sold at stores like Canadian Tire or Superstore usually follow Health Canada’s product safety standards. Look for BPA-free and heat-safe markings.
Is It Safe to Put Plastic in the Dishwasher?
Yes, but only if it’s labeled dishwasher safe and placed on the top rack. The top rack stays cooler, which helps prevent melting or warping.
Plastics without a dishwasher-safe label? The bottom rack is a no-go for most plastics, even the sturdy ones, because it is too close to the heating element. One wrong move and you’ve got a melted mess or lingering smells.
So if you want to keep your plastic (and your dishwasher) in good shape, check the label and stick to the top.
Which Plastics Can Go in the Dishwasher?
Here are the most common types of plastic and whether they’re safe to wash:
| Resin Code | Plastic Type | Common Uses | Dishwasher Safe? |
|---|---|---|---|
| #5 | Polypropylene (PP) | Reusable containers, travel mugs, baby items | ✅ Yes (top rack ideal) |
| #2 | HDPE | Milk jugs, detergent bottles | ✅ Yes (top rack only) |
| #1 | PET or PETE | Water bottles, takeout drink lids | ⚠️ Top rack only (can soften) |
Tip: If you’re asking, “Can I wash plastic in the dishwasher if it’s BPA-free?” then the answer is yes, but only if it also says that it’s dishwasher safe.
What Plastics Shouldn’t Go in the Dishwasher?
Avoid putting these into your machine, even if they look sturdy:
- #6 (Polystyrene): Found in foam containers or cheap utensils; melts easily.
- #3 (PVC): Flexible, usually used in wraps or squeeze bottles; can leak chemicals.
- Single-use plastic containers: Like soup or takeout tubs, they’re not built for heat and break down fast.
Top 5 Mistakes to Avoid When Washing Plastic in the Dishwasher
1. Putting Plastic on the Bottom Rack
The heating element sits below the bottom rack. Even dishwasher-safe plastic can warp or melt here. Stick to the top.
2. Using Heated Dry Cycles
High heat drying cycles warp or deform even the sturdiest plastic. Want to protect your containers? Let them air dry instead.
3. Overloading the Dishwasher
Plastic is light. If you overload the top rack, items flip or fall, and might land near hot zones. Give them space, especially lids and measuring cups.
4. Ignoring the Labels
No symbol? Don’t guess. Even a cool-looking tumbler or reusable bowl may not be dishwasher safe. When in doubt, hand wash it.
5. Keeping Damaged Plastic
Cloudy, cracked, or warped plastic can have bacteria and possibly release chemicals. If a container no longer seals or is misshapen, toss it away.
Best way to wash plastic containers in the dishwasher?
Top rack only. No heated dry. Don’t overload. Replace anything that’s worn out.
How to Wash Plastic in the Dishwasher (The Right Way)
To get clean results without damaging your containers or dishwasher:
- Use a basket for small items like baby bottle caps and straws.
- Stick to eco or low-heat settings when possible.
- Always place plastic on the top rack only.
- Pre-rinse sticky or greasy items before loading.
- Wipe the interior monthly.
Can a Dishwasher Melt Plastic?
Yes. If you’ve ever smelled burning plastic after a cycle, chances are something flipped onto the heating element or wasn’t safe to begin with.
What to Do if Plastic Melts
- Turn off the dishwasher and let it cool completely. Don’t try removing anything while it’s still hot.
- Gently scrape off the plastic once it’s hardened. Use a wooden spoon or silicone spatula; avoid metal tools to prevent scratches.
- Run an empty cycle with baking soda or white vinegar to get rid of any lingering smells.
- Check the spray arms and filters for melted bits or blockages.
Still smells bad or not working right? That’s your sign to call in a repair technician.
Winter Tip for Canadian Households
In colder areas, dishwashers usually use longer or hotter cycles in winter to maintain temperature. This increases the risk of plastic warping or melting, even top-rack items.
So, use eco settings where possible and avoid heated drying during the colder months.
FAQ: Plastic & Dishwashers
- Can plastic containers go in the dishwasher?
Yes, if they’re labeled dishwasher safe and placed on the top rack. - What happens if plastic melts in the dishwasher?
It can clog spray arms, damage heating elements, and leave a strong burnt smell. Let it cool, clean it safely, and run a rinse cycle. - Is BPA-free plastic safe in the dishwasher?
Only if it’s also marked dishwasher safe. BPA-free doesn’t always mean heat-resistant. - Why is top rack placement important?
The bottom rack gets too hot. Top rack = safer temp for plastic. - Can you wash plastic in the dishwasher if there’s no symbol?
Best not to. If it’s unmarked or feels flimsy, hand wash it instead.
Dishwasher Not Working Like It Should?
Melted plastic. Dirty dishes. Bad smells. These are signs your dishwasher might be damaged.
Dishwasher Repair in Vancouver
At Barton Appliance Repair, we fix:
- Spray arm clogs from plastic debris
- Heating element damage
- Drain issues
- Poor performance after melted plastic mishaps
🗸 Fast, local service across Vancouver
🗸 Licensed, insured technicians
🗸 Flat-rate pricing, no guesswork
Book a dishwasher repair today and get your kitchen back to normal!
Quick Recap: Can You Put Plastic in the Dishwasher?
Yes, but only if:
- It’s labeled dishwasher safe
- You place it on the top rack
- You skip high-heat drying
- You replace it when it cracks or warps
Stay smart, read the label, and protect both your health and your machine.
