Dishwasher detergent is alkaline and it attacks bare aluminum. The pan comes out grey, chalky or pitted, and that damage does not wash off.
Plain aluminum cookware reacts with strong dishwasher detergent, and the result is a dark, dull and often pitted finish. Hard anodized aluminum is tougher, but most of its makers still advise hand washing because the coating wears. Check the label before you load it.
| Short answer | No for plain aluminum |
|---|---|
| Why | Alkaline detergent oxidizes and darkens the metal |
| Hard anodized | Most makers still say hand wash |
| Nonstick aluminum | Hand wash to protect the coating |
| Fix for dull pans | A simple acid wash, such as cream of tartar or lemon juice |
How to clean aluminum cookware
- Wash with warm water and a mild dish soap and a soft sponge.
- Avoid steel wool and harsh scouring pads.
- Dry it straight away to prevent water spots.
- For a dull or dark pan, simmer water with lemon juice or cream of tartar for a few minutes.
- Rinse well and dry before storing.
What happens when you get it wrong
- Grey discoloration. The surface oxidizes, and the pan looks stained for good.
- Pitting. Tiny holes appear on the surface and hold food residue.
- Worn coating. Anodized and nonstick finishes lose their release over time.
Hand washing, which takes a couple of minutes.
Stainless steel pans, which are generally dishwasher friendly if you want to use the machine.
Frequently asked questions
Can you put hard anodized cookware in the dishwasher?
Most makers recommend hand washing, even when the coating is tough, because detergent wears it. Check your brand.
Why did my aluminum pan turn black in the dishwasher?
The detergent reacts with the metal. It is oxidation, and the surface is changed.
Can you restore a darkened aluminum pan?
Often, with simmered lemon juice or cream of tartar. Pits cannot be repaired.
Are aluminum baking sheets dishwasher safe?
They discolor the same way. Hand washing keeps them looking good.