Wood and dishwashers aren't usually a happy combination.
The prolonged exposure to hot water and heat can cause wooden boards to warp, crack, split, or develop rough surfaces.
And once a wooden board changes shape, it may no longer sit securely on your countertop.
Instead, wash wooden cutting boards by hand with warm water and dish soap, then dry them thoroughly.
For boards that need extra care, follow the manufacturer's cleaning and conditioning instructions.
What about bamboo?
Bamboo cutting boards should generally receive the same kind of gentle treatment.
Don't assume that because bamboo is hard and durable, it belongs in the dishwasher.
2. Wooden Spoons and Utensils
Your grandmother's wooden spoon may have survived decades of cooking, but that doesn't mean it needs a trip through the dishwasher.
Wood can absorb water and detergent and may eventually become:
- Cracked
- Splintered
- Warped
- Rough
- Discolored
Hand washing is quick, easy, and much kinder to wooden utensils.
And let's be honest.
If you're already standing at the sink washing one wooden spoon, washing two more isn't exactly going to ruin your evening.
3. Cast Iron Cookware
This is one of the big ones.
Keep traditional cast iron out of the dishwasher.
The combination of water, detergent, and heat can strip away the seasoning you've worked so hard to build.
It can also encourage rust.
And if you've ever carefully seasoned a cast-iron skillet, you know that losing that beautiful surface is not something you want to discover after a dishwasher cycle.
For traditional cast iron, clean according to the manufacturer's recommendations and dry it thoroughly after washing.
What about enameled cast iron?
That's different.
Some enameled cast-iron cookware may be labeled dishwasher-safe, but manufacturers can vary in their recommendations.
Always check the specific brand and model.
4. Kitchen Knives
Your good kitchen knives deserve better than being tossed into the dishwasher.
The heat, detergent, moisture, and contact with other objects can dull or damage the blade.
There's another problem, too.
Sharp knives can be a safety hazard when you're loading and unloading the dishwasher.
Hand washing your chef's knife with warm water and dish soap takes very little time.
Wash it carefully, dry it immediately, and put it away safely.
What about inexpensive table knives?
Those are generally a different story.
Many ordinary stainless-steel table knives are dishwasher-safe.
The point here is to protect quality kitchen knives and specialty blades, not ban every knife from the appliance.
5. Nonstick Cookware
Nonstick cookware deserves a little extra attention.
Some modern nonstick pans are specifically labeled dishwasher-safe.
Others aren't.
Repeated dishwasher cycles can contribute to wear of certain nonstick coatings, especially when combined with high heat and strong detergents.
If your pan's manufacturer recommends hand washing, follow that advice.
A soft sponge and mild dish soap usually make cleaning nonstick cookware surprisingly easy anyway.
And protecting that slippery surface is worth the extra minute.
6. Copper Cookware
Beautiful copper cookware is another item I'd keep out of the dishwasher unless the manufacturer specifically says otherwise.
Dishwasher detergents can affect the appearance of copper and may cause discoloration or tarnishing.
And let's be honest.
Part of the reason people love copper cookware is because it's beautiful.
You don't want to open the dishwasher and discover your gorgeous copper pan has suddenly developed an entirely new personality.
Hand washing is the safer choice for traditional copper cookware.
7. Aluminum Cookware
Plain aluminum cookware can react with dishwasher detergents and may come out dull, darkened, or discolored.
That doesn't necessarily mean the pan is ruined, but it can dramatically change its appearance.
Some aluminum cookware is dishwasher-safe because it has a specific finish or coating.
Again, check the manufacturer's instructions.
If there's no dishwasher-safe label, hand washing is the safer bet.
8. Crystal and Delicate Glassware
Your everyday drinking glasses are one thing.
Fine crystal is another.
The heat, detergent, water pressure, and movement inside the dishwasher can increase the risk of scratching, clouding, chipping, or breaking delicate glassware.
Some modern crystal and specialty glassware may be designed for dishwasher use, so don't assume every delicate-looking glass is automatically forbidden.
But if you're dealing with an heirloom piece or something particularly valuable?
I'd wash it by hand.
Especially if losing it would make you say:
“Oh no. Oh no, no, no.”
9. Hand-Painted Dishes
Those beautiful hand-painted plates may look sturdy, but decorative finishes can be much more delicate than the underlying ceramic.
Repeated dishwasher cycles can contribute to fading, wear, or damage to painted details.
If a dish is handmade, hand-painted, antique, or particularly sentimental, hand washing is usually the more cautious choice unless the maker specifically says it is dishwasher-safe.
10. Vintage or Antique Dishes
This is one of my biggest “think twice” categories.
Older dishes can have finishes, decorations, glazes, or construction methods that weren't designed for modern dishwasher cycles.
Gold or silver trim is especially worth protecting.
And there's another reason to be cautious:
Sentimental value can't be replaced.
If a plate belonged to your grandmother, came from an old family china set, or is difficult to replace, don't experiment with the dishwasher just because it looks sturdy.
Give it a gentle hand wash instead.
11. Items With Gold or Metallic Trim
That pretty gold rim around your favorite plate?
It may not appreciate repeated trips through the dishwasher.
Decorative metallic finishes can fade or wear over time, particularly when exposed repeatedly to dishwasher detergent and heat.
The same caution applies to certain silver-colored or metallic decorative details.
If the manufacturer says dishwasher-safe, follow those instructions.
If you're unsure, hand wash.
12. Insulated Travel Mugs and Tumblers
This one catches people by surprise.
Some insulated mugs and tumblers are dishwasher-safe.
Others aren't.
The concern isn't simply the cup itself. Certain insulated products have components, finishes, seals, or vacuum insulation systems that manufacturers may tell you to protect from dishwasher conditions.
Some also contain lids with multiple small parts that need special cleaning.
Before tossing your favorite travel mug into the dishwasher, check its care instructions.
Because the last thing you want is your morning coffee companion coming out damaged.
13. Items With Glued or Delicate Parts
Anything held together primarily with glue deserves some caution.
Dishwasher heat and prolonged moisture can weaken adhesives.
That can include certain:
- Decorative utensils
- Specialty kitchen gadgets
- Wooden-handled tools
- Decorative serving pieces
- Small appliances or accessories with glued components
If something looks like several pieces were permanently attached rather than molded as one solid piece, check the care instructions first.
14. Some Plastics
This one requires a little nuance.
Not all plastic is dishwasher-safe.
Some plastic containers can warp, melt, discolor, or become damaged by heat.
Others are specifically designed for the dishwasher.
Look for a dishwasher-safe label or symbol and follow the manufacturer's rack-placement instructions.
And if a plastic container is old, brittle, warped, or unlabeled?
Hand washing may be the safer choice.
Keep an eye on the top rack
Some plastic items that are dishwasher-safe are recommended for the top rack only, where temperatures may be less intense than near the heating element.
Don't automatically assume that “dishwasher-safe” means “put it anywhere.”
15. Anything With a Manufacturer's “Hand Wash Only” Warning
This might sound obvious, but it's worth saying.
If the manufacturer specifically tells you to hand wash an item, believe them.
There's a reason that instruction is there.
Manufacturers know how their materials, coatings, finishes, seals, and construction respond to heat, water, and detergent.
Your dishwasher may be perfectly happy to accept the item.
The item itself may not be.
What About Non-Electric Kitchen Gadgets?
A lot of kitchen gadgets fall into a gray area.
Garlic presses.
Graters.
Mandolins.
Measuring cups.
Silicone tools.
Strainers.
Food storage containers.
Some are dishwasher-safe.
Some aren't.
And some have specific instructions about which rack to use.
Before assuming something is safe because it's made of stainless steel or silicone, check the product instructions.
Silicone is not automatically dishwasher-proof
Silicone generally handles heat well, but that doesn't mean every silicone product has identical care instructions.
The design, embedded materials, coatings, and manufacturer's recommendations still matter.
What Can Go Wrong If You Ignore the Care Instructions?
Usually, the worst-case scenario isn't dramatic.
It's just annoying.
Your favorite wooden spoon cracks.
Your nonstick pan starts looking worn.
Your gold-rimmed plate loses some of its decoration.
Your plastic container comes out warped.
Your knife isn't as sharp as it used to be.
But repeated exposure can gradually shorten the useful life of kitchen items.
And sometimes the damage happens surprisingly quickly.
That's why prevention is so much easier than trying to restore something after it's already been damaged.
A Simple Dishwasher-Safe Checklist
Before putting a questionable item in the dishwasher, ask yourself:
Is it made of wood?
If yes, check the care instructions. Hand washing is often the better choice.
Is it traditional cast iron?
Keep it out of the dishwasher.
Does it have a delicate finish?
Think twice.
Is it vintage, antique, or sentimental?
Hand wash unless you're certain it's dishwasher-safe.
Does it contain glued parts?
Check the manufacturer's instructions.
Is it plastic?
Look for a dishwasher-safe marking and recommended rack placement.
Is it a specialty item?
Check the manufacturer's care instructions.
Does it have gold, silver, or metallic decoration?
Hand washing is generally the safer choice unless specifically labeled dishwasher-safe.
Things That Are Usually Dishwasher-Safe
Now let's give the dishwasher a little credit.
There are plenty of kitchen items that are made for it.
Depending on the manufacturer's instructions, these commonly include:
- Standard glass drinking glasses
- Everyday ceramic plates
- Stainless-steel utensils
- Dishwasher-safe food storage containers
- Many silicone utensils
- Dishwasher-safe baking dishes
- Many stainless-steel cookware pieces
- Everyday bowls and mugs
The important phrase is “depending on the manufacturer's instructions.”
Materials alone don't always tell the whole story.
Two objects can look almost identical but have completely different care requirements.
The Dishwasher's Biggest Enemy? Assuming Everything Is the Same
This may be the biggest lesson.
A wooden spoon isn't the same as a stainless-steel spoon.
A vintage plate isn't the same as a modern dishwasher-safe plate.
A traditional cast-iron skillet isn't the same as a dishwasher-safe stainless-steel pan.
And a plastic container isn't automatically safe just because it survived the dishwasher once.
Materials, coatings, construction, age, and manufacturer instructions all matter.
How to Make Hand Washing Less Annoying
If you've just looked at this list and thought, “So I'm supposed to wash half my kitchen by hand?”
Not at all.
You just need to be selective.
Keep a small dish brush and a good sponge near the sink.
Wash delicate items while you're already cleaning up after dinner.
For wooden utensils, knives, and specialty cookware, a quick hand wash often takes less than a minute.
And here's a little trick:
Don't let them pile up.
If you wash the few hand-wash-only items while the dishwasher is running, they barely feel like extra work.
Frequently Asked Questions
Can I put stainless steel in the dishwasher?
Many stainless-steel kitchen items are dishwasher-safe, but not all. Check the manufacturer's instructions, especially for specialty cookware or items containing other materials.
Can wooden utensils go in the dishwasher?
They're generally better washed by hand because prolonged exposure to hot water, detergent, and heat can cause cracking, warping, or splitting.
Can I put cast iron in the dishwasher?
Traditional cast iron should generally be kept out of the dishwasher because detergent and prolonged moisture can damage its seasoning and encourage rust.
Can nonstick pans go in the dishwasher?
Some are labeled dishwasher-safe, while others should be hand washed. Follow the manufacturer's instructions to protect the coating.
Can plastic containers go in the dishwasher?
Some can and some can't. Look for the dishwasher-safe marking and follow any instructions about top-rack placement.
Why shouldn't I put expensive knives in the dishwasher?
Dishwasher conditions can dull or damage blades, and loose sharp objects can also create handling hazards when loading or unloading the machine.
Can crystal go in the dishwasher?
Some modern crystal is designed for dishwasher use, but delicate, valuable, or heirloom crystal is generally better hand washed unless the manufacturer specifically approves dishwasher cleaning.
Can vintage dishes go in the dishwasher?
It's safer to hand wash vintage or antique dishes unless you're confident they're dishwasher-safe. Decorative finishes and older materials may not tolerate modern dishwasher cycles well.
What should I do with gold-rimmed plates?
Hand wash them unless the manufacturer specifically says they're dishwasher-safe. Repeated dishwasher cycles can wear decorative metallic finishes.
Is the top rack always safer?
No. Some dishwasher-safe items are specifically recommended for the top rack, but you should follow the care instructions for each item.
A Little Extra Care Can Save Your Favorite Kitchen Things
The dishwasher really is one of the best kitchen inventions.
It saves time.
It saves effort.
And on those nights when the sink looks like a small mountain of dirty dishes, I wouldn't want to be without one.
But even the most hardworking appliance has limits.
Wood can crack.
Cast iron can rust.
Nonstick coatings can wear.
Decorative finishes can fade.
Plastic can warp.
And sentimental dishes can become casualties of a cycle they never should have entered.
So before you hear that familiar dishwasher door click and walk away, take one second to look at what you've loaded.
If something is wooden, vintage, delicate, specialty-coated, insulated, decorated, or labeled “hand wash only,” give it a second thought.
Sometimes the extra minute at the sink is worth it.
Especially when the thing you're washing is your favorite kitchen treasure.
And honestly?
I'd rather spend 30 seconds washing Grandma's old serving spoon by hand than spend years wishing I had.