Some dishwashing detergents can really do serious harm to finishes, like the stainless gun above.
That is the reason Sterling Silver flatware and such is to NEVER go into dishwasher. Just like putting Rubber Bands on Sterling Silver a discoloration will occur. THE only way to remove discoloration is to polish it off ,with a buffing wheel on a polishing machine using Fabulustre, various rouges ( red, white, black) . If silverplated, you are really screwed, because then if one polishes, you have gone down to base metal. IIRC $400 to have a S/P tray re silvered.
Mother in laws S/P tray mind you...the one with the engraving of 25th Wedding anniversary.
If another chemical is introduced ( mixed) with the dishwashing detergents...either from the gun itself...or the gun owner figures he can "help move stuff along quicker"...by adding a solvent....
Old boy learned the cost of a new Nickel finish was expensive from Colt. It had to wait , new dishwasher for the wife had to be bought first.
Why do stuff like this?
Yes there is recipe to cook fish in the dishwasher. I actually witnessed this.
Clean the trout, lemon and butter inside the trout wrap in foil. Just like you would do in a oven, or in the coals of campfire. Tossed on top rack of dishwasher, it gets hot enough during rinse and dry cycle to cook the trout.
Oh one fellow did all the above "stunts". The Colt, the silverware, MIL S/P tray, and the fish. He has a PhD. In Education btw. I understand ( from his wife with clenched teeth) he has pulled a lot of stunts...keeps learning how to pull more stunts...was not quite so bad before the Internet she said.