Silver Plastic Silverware Dishwasher Stainless Silverware Gets "tarnished" And Film On Plastic Glasses?

Dishwasher stainless silverware gets "tarnished" and film on plastic glasses? - silver plastic silverware

Our dishwasher for several years, if you have a powder detergent leaves silver steel with what looks like the sterling silver has been in a long time, a "film" polished in our plastic cups.

Suggestions welcome, thank you.