Why is the dishwasher not recommended for the All-Clad MC2 line of pot and pans

cleaningequipmentpanpotstainless-steel

I just looked on the All-Clad website (faq 7 and faq 13). It says that because the MC2 has a brushed aluminum alloy exterior, it mush be hand washed. Why is the dishwasher bad for it?
It's just soap and water (and sometimes rinse aid) right? Is it the rinse aid that does something to the pot/pan? Is it because the jets of the dishwasher too strong for the pot?

Best Answer

The usual reason given is that Aluminum will react with the alkalis in dishwasher detergent and discolour.

Automatic dishwasher detergent has a lot of stuff in it.