8 Things You Absolutely Should Not Put in a Dishwasher **(And Why)

Frequently Asked Questions
Can I put stainless steel in the dishwasher?
Yes, most stainless steel cookware and cutlery are perfectly safe. However, high-end chef’s knives should still be hand-washed to preserve their sharpness.
What about plastic containers?
Check the bottom for a “dishwasher safe” symbol. Always place them on the top rack to avoid melting from the bottom heating element, and avoid washing old or cracked plastics.
Is it okay to wash aluminum foil or trays?
Generally, no. Aluminum can discolor, pit, or react with detergents. It is best to hand wash aluminum bakeware.
Can I wash my blender jar in the dishwasher?
Many blender jars are top-rack safe, but always check the manual. The motorized base unit should never go in the dishwasher.
Why does my dishwasher smell bad?
This is usually caused by food debris trapped in the filter or spray arms. Clean the filter, wipe the door seal, and run a vinegar cleaning cycle.
Can I wash my cutting boards in the dishwasher?
Plastic cutting boards are usually safe. Wooden cutting boards should always be hand-washed to prevent warping, splitting, and cracking.
What if I accidentally washed something I shouldn’t have?
Assess the damage immediately. Re-season cast iron right away, oil wooden items, and sharpen dulled knives. If crystal has clouded, try a vinegar soak, though severe etching may be permanent.
Your Kitchen Care Action Plan
This Week: Audit Your Kitchen
Check your knives for dullness and start hand-washing them. Inspect your cast iron for rust and re-season if needed. Look at your travel mugs to ensure they aren’t losing insulation, and remove all adhesive labels from new dishes before loading them.
This Month: Optimize Your Dishwasher
Clean the filter and spray arms, and run a deep-cleaning vinegar cycle. Organize your loading strategy (heavy items on the bottom, delicate on top) and share this guide with family members who help with cleanup.
Ongoing: Maintain Good Habits
Consistently hand-wash delicate items. Remember to scrape, not rinse, before loading. Keep the rinse aid dispenser full, and replace worn-out rack tines to prevent scratching your dishes.
Final Thought: Respect Your Tools
Your kitchen tools are investments. Treating them with care ensures they serve you beautifully for years to come. The dishwasher is a fantastic helper, but it’s not a magic box. Knowing its limits protects your belongings and keeps your kitchen running smoothly.
So next time you’re tempted to toss that wooden spoon or sharp chef’s knife into the rack, pause. Take a moment to hand-wash it, dry it with care, and store it properly. Because the best meals aren’t just about the food—they’re about the tools that help you create them.
“Care for your tools, and they will care for you.”
What’s the one item you regret putting in the dishwasher? Share your story below—we’re all learning to protect our kitchens, together.