Are aluminum tumblers from the 50's dishwasher safe? Are any of the newer ones? ?

Question

Or are they all hand wash only?

Answer 1

Never ever put aluminium in the dishwasher.  It will stain it (something in the dishwasher powder).  I agree with the comment too about using aluminium not being a good idea.  That is why it is not used today for utensils.

Answer 2

They will oxidize with the caustic chlorine based detergent.  Sorry, anodized aluminum cups are to be hand washed.    I wouldn't use them at all.   They increase aluminum ion consumption.  Aluminum is found to contribute to Alzheimer's disease.

Answer 3

It depends.  Do you have soft water?  If not, then you're going to get lime buildup on the tumblers.  I would think that the newer ones are the same.  They may have a newer finish to protect them, but even that will wear away.