This is a clickbait household headline, but the underlying advice is mostly real. Some items really can be damaged by dishwasher heat, strong detergent, and water pressure.
Here are 8 things you generally should not put in a dishwasher (and why):
1. Wooden items (cutting boards, spoons)
- Can crack, warp, or split from heat and moisture.
2. Cast iron cookware
- Dishwasher removes seasoning and causes rust.
3. Non-stick pans
- Harsh detergents can damage the coating over time.
4. Sharp knives (chef’s knives)
- Heat and movement dull the blade quickly.
5. Crystal or delicate glassware
- Can become cloudy or crack under high heat.
6. Copper, brass, or aluminum items
- Can tarnish, discolor, or corrode.
7. Insulated bottles or travel mugs
- Dishwasher can damage vacuum seals, reducing insulation.
8. Certain plastics (not dishwasher-safe)
- May warp or leach chemicals if not heat-rated.
Simple rule to remember
If it is wood, sharp, delicate, coated, or insulated → wash by hand.
Reality check
- Dishwashers are safe for most everyday dishes and stainless steel items
- Problems happen mainly with heat-sensitive or coated materials
Bottom line
The headline is exaggerated for clicks, but the advice itself is practical: not everything in the kitchen is dishwasher-safe, even if it fits inside.
