No, you generally should not put a mandoline slicer in the dishwasher. The high heat and harsh detergents can warp plastic components, dull the blade, and damage nonstick coatings. Even models labeled “dishwasher safe” often degrade faster with repeated dishwasher cycles.
Most mandoline slicers are not dishwasher safe due to heat and chemical damage. Hand washing with warm soapy water is recommended to preserve sharpness and structural integrity.
- Heat sensitivity: Dishwasher temperatures (130–170°F) can warp ABS plastic and acrylic components, causing the blade to sit unevenly.
- Blade dulling: Harsh dishwasher detergents and water jets can dull the stainless steel blade faster than hand washing.
- Nonstick coatings: Many mandolines have a nonstick coating on the carriage or blade; dishwasher cycles can cause peeling or flaking.
- Manufacturer warnings: Most major brands (OXO, Benriner, Kyocera) explicitly state not dishwasher safe in their care instructions.
Why Dishwasher Cleaning Is Risky
Mandoline slicers are precision tools with sharp blades and often multiple moving parts. The dishwasher’s high heat can warp plastic bodies—especially on budget models made from acrylic or ABS plastic. Once warped, the blade no longer sits flush, leading to uneven cuts and increased risk of slipping.
Furthermore, the strong alkaline detergents used in dishwashers can attack nonstick coatings on the carriage or blade. Over time, this causes the coating to peel, exposing metal that can rust or stick to food. Even stainless steel blades can become microscopically pitted from the detergent, shortening their lifespan.
Another concern is safety: the blade is exposed inside the dishwasher basket. Retrieving it can lead to accidental cuts, especially if other items shift and press against the edge.
How to Hand Wash a Mandoline Slicer Safely
- Immediately after use, rinse the blade and carriage under warm running water to remove food debris.
- Use a soft sponge or brush with mild dish soap and warm water. Avoid abrasive scrubbers that can scratch the blade or coating.
- For stuck-on bits, soak the slicer in warm soapy water for 5–10 minutes. Do not soak for long periods, as water can seep into crevices and cause rust.
- Use a specialized blade guard or a stiff brush to clean the blade edge—never wipe the edge with a bare hand.
- Rinse thoroughly with clean water and dry immediately with a soft towel. Air drying can leave water spots or promote rust on the blade.
- Store the mandoline with the blade guard on, in a dry place. If the unit disassembles, separate parts for thorough drying.
What About “Dishwasher Safe” Models?
Some mandoline slicers—like those from Prepworks or certain plastic models—claim to be dishwasher safe. However, “dishwasher safe” usually means the plastic won’t melt, but it doesn’t guarantee the blade or coating won’t degrade. Many users report that after a few dishwasher cycles, the blade becomes noticeably duller and the plastic develops a haze or crack.
If you do choose to dishwasher a labeled model, place it on the top rack away from the heating element, use a gentle cycle, and skip the heated dry. Even then, expect a shorter overall lifespan. For premium mandolines (e.g., Benriner, OXO Good Grips), the manufacturer’s manual explicitly forbids dishwasher use to maintain warranty coverage.
Cleaning Specific Materials: Plastic, Metal, and Ceramic
- Plastic bodies: Hand wash only; avoid bleach or citrus-based detergents that can weaken the plastic. Check for cracks after each wash.
- Stainless steel blades: Dry immediately after washing to prevent water spots or rust. A light coat of mineral oil on the blade can help protect it between uses.
- Ceramic blades: These are brittle and can chip if knocked against other dishes. Hand wash gently with a soft sponge and dry thoroughly. Never use abrasive cleaners.
- Nonstick coatings: Use only silicone or nylon brushes. Avoid stacking heavy items on top of the carriage during storage.
How to Remove Stubborn Odors and Stains
If your mandoline absorbs odors from garlic, onion, or acidic foods, make a paste of baking soda and water. Apply it to the plastic parts and let sit for 15 minutes, then rinse. For stains on the blade, wipe with a cloth dipped in white vinegar, then rinse and dry.
Never use chlorine bleach or hydrogen peroxide on the blade—they can corrode the metal. For deep cleaning, some users run a lemon half over the blade (using the guard) to naturally lift stains and odors. Always ensure the blade is completely dry before storing to prevent rust.
Pro Tips
- Use a dedicated blade brush (often sold with the mandoline) to clean the edge without touching it.
- After washing, store the mandoline with a silica gel packet in its drawer to absorb moisture and prevent rust.
- If you must wash in a dishwasher, remove the blade and hand wash it separately while placing the plastic parts on the top rack only.
- Test a small hidden area with dish soap if you’re unsure about the coating—some nonstick finishes react poorly to citrus-based soaps.
Common Mistakes to Avoid
- Soaking the mandoline for hours can cause water to enter the blade housing, leading to rust inside the mechanism.
- Using steel wool or scouring pads scratches the blade and plastic, creating crevices where bacteria can hide.
- Putting the mandoline in the dishwasher with the blade exposed increases the risk of cutting yourself when unloading.
- Assuming “dishwasher safe” means you can use the heated dry cycle—this is the primary cause of warping and coating damage.
FAQ
Can I put my stainless steel mandoline in the dishwasher?
Even all-metal mandolines (like some commercial models) should be hand washed. The high heat and detergent can discolor the metal and dull the blade. Plus, the blade is a safety hazard in the dishwasher basket.
How do I dry my mandoline after washing to prevent rust?
Use a lint-free cloth to dry all parts immediately, especially the blade and any metal components. You can also use a low heat setting on a hair dryer for hard-to-reach crevices, but avoid overheating plastic parts.
What should I do if my mandoline blade gets rust spots?
Light rust can be removed with a paste of baking soda and water, gently rubbed with a soft cloth. Rinse and dry thoroughly. For heavy rust, replace the blade if possible, or consider a new mandoline.
The Bottom Line
To keep your mandoline slicer performing at its best, stick to hand washing with mild soap and immediate drying. While the dishwasher might seem convenient, the risk of warping, dulling, and damage far outweighs the time saved. Treat your mandoline like the precision tool it is, and it will reward you with years of consistent, safe slicing.
