The affected items are not corrosion resistant.
No remedy.
Purchase cutlery which is dishwasher-safe.
There are rust stains on the cutlery.
No remedy.
Purchase cutlery which is dishwasher-safe.
Immediately after filling the salt container and each time you remove the salt container cap, run the [Rinse out salt] program (depending on the model) without any wash items present or run another low-temperature program without any wash items present to dissolve and remove any traces of salt from the wash cabinet.
Reattach it, making sure that it screws back on correctly.