
Wondering What To Put In A Dishwasher? Not These 11 Things
If you appreciate your dishwasher as much as I do, then you owe a debt of gratitude to its inventor, Josephine Cochran! According to the United States Patent and Trademark Office, the patent for the first practical dishwasher was issued to Cochran on December 28, 1886.
The dishwasher didnโt make its way into most American homes until the 1950s, but Cochranโs ingenuity provided the spark that made it possible. And our lives are all the better for it! :-)
Related: The One Neglected Kitchen Item You Need To Clean ASAP
Iโve written extensively about dishwashers here on my blog, including how to clean them, what you should know about them, and surprising things you can clean in them. Todayโs post will expand on that collection of dishwasher knowledge, but weโll be focusing specifically on things you should never put in your dishwasher!
11 Things You Should Never Put In Your Dishwasher

1. Thin Plastic Containers
A lot of plastic containers are dishwasher safe, but the thinner the plastic is, the more likely it is to warp or even melt in your dishwasher. (I experienced this very issue several years ago, where a thin plastic container melted and ended up clogging the drain at the bottom of my dishwasher.)
Feel free to keep and reuse plastic containers, but you may want to wash them by hand to be safe (or at least put them in the top rack only.)
Related: 15 Smart Ways To Reuse Plastic Containers

2. Narrow Bottles
Chances are slim that your dishwasherโs sprayer arms are going to get much water or detergent up into a narrow-necked bottle. Save yourself the disappointment by washing narrow-necked bottles by hand instead.
You can pick up a set of bottle cleaning brushes for just a few dollars online, or you can try this highly useful bartenderโs trick!

3. Wooden Utensils, Cutting Boards, Etc.
The intensely hot environment of your dishwasher is very unfriendly to wood! Wood and bamboo kitchen tools can dry out, warp, and even crack after repeated trips through the dishwasher.
Wash these items by hand instead using soapy water. And be sure to treat them occasionally with a wood wax/butter to protect the wood and extend its lifespan!

4. Certain Types Of Cookware
Many types of cookware are dishwasher-safe, and theyโll usually tell you so. But some types should never go in the dishwasher, including the following:
- Cast Iron – Exposed cast iron will rust in the dishwasher, and you shouldnโt wash it with soap either. (For tons of useful information about caring for cast iron, read my post here!)
- Copper – Dishwasher detergents can dull the shiny surface of copper cookware.
- Nonstick – Harsh detergents can quickly wear down the fragile nonstick coating, and hand washing will help extend its lifespan.
- Aluminum – Dishwasher detergents will oxidize aluminum items like sheet pans, so stick to hand washing if you want that shiny finish to last!

5. Containers With Paper Labels
It can be tempting to put a container with a paper label into the dishwasher in hopes that the dishwasher will remove the label for you. But speaking from personal experience, it rarely goes that smoothly!
What usually happens is that the upper layer of the sticker/label separates from the jar and gets stuck somewhere at the bottom of the dishwasher. Then you still have to remove the sticky residue from the jar, AND scrape the sticker gunk out of your dishwasher!
So save yourself the headache of that process by checking out my exhaustive guide of how to remove stickers, labels, and other gunk from old containers! :-)

6. Graters, Garlic Presses, Microplanes, Etc.
Dishwashers donโt do a great job of cleaning out the tiny nooks and crannies found on garlic presses, microplanes, and other types of tools. Wash these items by hand instead to make sure theyโre getting cleaned properly.

7. Fine China & Crystal
Fragile items like fine china and crystal should always be washed by hand to avoid damage. Once theyโre dry, buff them with a microfiber cloth for a brilliant shine!

8. Rubber Parts
If you’re wondering whether rubber can go in the dishwasher, the answer is that it probably shouldn’t. Detergents and hot water can cause rubber to dull and break down over time. Double-check your dishes for less obvious rubber parts (like gaskets, seals, and bases) before loading them into the dishwasher.
Taking a few extra minutes to wash items with rubber parts by hand can keep extend their lifespan by a large margin!

9. Certain Stand Mixer Attachments
Most models of stand mixers come with the same types of attachments, but thereโs no guarantee what material theyโll be made out of! If yours are made of aluminum, youโll definitely want to wash those by hand to avoid oxidation.
If your stand mixer attachments are โcoated,โ then it may be okay to wash them on the top rack of your dishwasher. Check the user manual that came with your stand mixer for care and washing instructions to make sure.

10. Kitchen Knives
Go ahead and toss your butter knives and steak knives in the dishwasher, but take an extra minute to wash your kitchen knives by hand. A good, sharp knife is your most valuable tool as a chef, and it will only stay that way if you treat it gently!

11. Printed Measuring Cups
Harsh detergents and heat will almost always cause printed ink to crack and fade over time. This is especially annoying when it comes to things like measuring cups, because they arenโt particularly useful without those printed measurements!
Wash items with printed ink by hand to make sure those labels stay readable for longer.
NOTE: You may wonder why liquid dish soap is not on this list. That’s because you actually can use dish soap in your dishwasher if you do it right — I know, because I’ve done it! You won’t get the same great results you do from dishwasher detergent, but it will do in a pinch.
Do you have specific kitchen items that you never put in the dishwasher?





























As well as kitchen knives, I never put the knives from my everyday silverware in the dishwasher.
Please log in or create a free account to comment.Jillee, thank you. I have been trying to make my daughter hand wash my glass measuring cups for 3 yrs now. I just showed this to her and she has agreed to stop sticking them in the DW! Plus, they take up so much room!
THANKYOUTHANKYOUTHANKYOUTHANKYOU.
Please log in or create a free account to comment.P.s. my metal straws also get hand washed. No dishwasher is going to clean up inside those tubes!
Please log in or create a free account to comment.Measuring spoons that are printed for the same reason as the measuring cup…..the printing wears off. And while I can figure out which is which who has time for that when you are mixing something up?! Plus one of my sets has 5 spoons and one has four….lolol
Please log in or create a free account to comment.I find that #5 plastic (polypropylene) does just fine on the top rack even in a high heat cycle. It’s the other plastics like #1 and #2 that get warped and melt unless they happen to be extra thick. I check my recycling labels and #5 goes in the dishwasher on top and everything else gets hand washed.
Please log in or create a free account to comment.I have a brand new Whirlpool dishwasher and it cleans my grater, my garlic press, and my zester (is that the same as a microplaner?) just fine! Nothing has stuck to any of these items that I use.
Please log in or create a free account to comment.I wash “handled” colanders – those sets of different sizes with handles – by hand, as debris collects between the mesh and the metal ring around the outside so that I have to wash it again by hand anyway. Before my food processor bowl broke I had started washing it by hand as well as it would collect gunk in an impossible-to-reach spot (one of those tiny brushes for cleaning hummingbird feeders was the only thing that would reach) at the base of the handle, putting undue strain on the locking mechanism that eventually transferred to the rim and caused it to chip when locking the lid in place. It was a long-standing model that’s been discontinued, so hopefully subsequent designs have corrected this flaw. But I’m still waiting for a glass food processor with all the bells and whistles of the plastic ones.
Please log in or create a free account to comment.Never put antique china in the dishwasher. The glaze may fade and the high heat may even break them. They were made long before dishwashers and so naturally werenโt intended to withstand that environment.
Please log in or create a free account to comment.My dishwasher has a cycle specifically for crystal and fine china, I use that if washing dishes after having company and I have used our “good” china and crystal goblets.
Please log in or create a free account to comment.I do wash my printed measuring cups in the dishwasher, but I put them on the top rack, I’ve had them for fifty two years and they still have their printed numbers and lines on them.
I must admit to something that is probably a “no no” to many folks, but I rinse my dirty dishes before putting them in the dishwasher. (My kids say, “Mom washes the dishes before she washes the dishes.”) I never, or hardly ever use the “Regular Cycle,” but I use the “Speed Cycle” and that cycle, on my dishwasher that is 15+ years old, does not have a “dry cycle.” The dishes are so hot when the cycle is over that they literally dry themselves.
If one of us is ill with flu or a bad cold, I do use the Regular Cycle and let the dishes go through the “Dry Cycle.”
As for very thin plastic containers, I recycle them, as this area has a recycle truck that picks up glass, plastic, and metal cans one week and paper and cardboard the next week. I do not reuse thin plastic containers.
Sadly, not many of our neighbors recycle but throw everything into their garbage that is picked up every week. Some neighbors let friends and relatives, from other towns, that do not have garbage pick up, dump their garbage in their driveway to be picked up. Someday this will end our “free,” ( our taxes pay for this) garbage pickup service. I have some plastic containers for left overs, which I have purchased for this purpose, but that plastic is sturdy enough to be washed on the top rack.
My good knife have softer “rubber” ergonomic handles that kept coming out with white ish coating. Probably due to detergent but I take no chances anymore.
Please log in or create a free account to comment.Side note: I have a much older dishwasher, I also had Corel plates that faded their lines with a fancy pod, so regular old liquid for me!
I have clear acrylic mugs/cups that I handwash, otherwise they get that โfrosty lookโ
Please log in or create a free account to comment.Add those cups with screw on lids and straws. Instructions on the ones I have say to wash by hand as they do have rubber seals.
Please log in or create a free account to comment.You’d think that after all these generations and such, our dishwasher’s would be able to do more, not less, over time! Instead, our technological advances are replaced by marketing ploys to make appliances break after a limited amount of time so we will have to buy another one!
Our house was built in 1993, and has all the original house appliances like AC unit, furnace, and water heater. I am scared to have to replace them eventually (they all work WELL still!) with an inferior product.
Please log in or create a free account to comment.I agree! My house was built in 1991 and has the original water heater, furnace, and fridge. Previous owner replaced stove and dishwasher, but they are older models. I’m going to use them until they die!
Please log in or create a free account to comment.We, too, have old appliances. When by dryer “died” I tried to buy a new dryer but they make appliances bigger each year and a new dryer would not fit in our bathroom where I have a washer with the dryer stacked on top. What a dilemma. I asked a local appliance store if they had a dryer that was the same measurement as my old dryer. They told me that they did not, BUT, they had a technician who repaired old appliances. Hooray, he came the next day are completely rebuilt my dryer and told me that if the washer “died” he could rebuild that, too.
Please log in or create a free account to comment.PS
I should have added that the dryer and washer are 15 years old. As is my dishwasher, microwave, and refrigerator. I hope that this young man can repair the dishwasher as it fits snugly under our kitchen counter. The refrigerator and microwave could probably be replaced, although I would need someone to install the microwave. My husband installed the one we have now, but at 82, he tells me that he is not doing that again. The thing weighed a “ton” and a bigger one will weigh more, but hopefully it can be installed over our stove.
You might consider having someone look at your furnace anyway. Our rental was built in ’76 & has original furnace.Our electric bill continues to go up every year that we have lived here. Nothing else has changed, just that steadily increases. It is probably going & it is NOT energy efficient. But since we rent, the landlord won’t replace any appliance until it completely dies. Fingers crossed.
Please log in or create a free account to comment.Add, silver. I put my silver in the dishwasher for years, but the formula on all dishwashing soaps I have tried lately, tarnishes it badly. I now wash it by hand.
Please log in or create a free account to comment.If you use a dish washing powder or liquid that contains lemon it can damage silver or stainless utensils.
Please log in or create a free account to comment.repair man and customer service told me long time ago never to put sterling silver in diswasher. makes it tarnish.
Please log in or create a free account to comment.I can’t begin to tell you how many baby bottle nipples ended up melted at the bottom of my dishwasher. Ugh! I can still smell the odor 30 years later! Yeesh!
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